Materiały źródłowe

• #1 About Alzheimer’s | Alzheimer’s Disease and Dementia | CDC

  https://www.cdc.gov/alzheimers-dementia/about/alzheimers.html

  Alzheimer’s disease is the most common type of dementia. […] Alzheimer’s disease is a brain disorder caused by damage to nerve cells in the brain. […] We do not yet fully understand what causes Alzheimer’s disease. There likely is not one single factor, but rather a combination of factors that cause the disease. These factors, which may affect each person differently, include: Genes. Family history. Environmental factors. Lifestyle behaviors. […] Treatment of Alzheimer’s depends on the underlying cause and the progression of the disease.

• #2 Alzheimer’s Disease: Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/9164-alzheimers-disease

  Alzheimers disease (AD) is the most common cause of dementia. […] An abnormal build-up of proteins in your brain causes Alzheimers disease. Specifically, two proteins called amyloid and tau. […] When amyloid and tau proteins build up in your brain, they slowly kill neurons. This causes permanent damage that leads to Alzheimers symptoms. […] Experts are still studying Alzheimers disease to learn more about what exactly causes these proteins to build up. […] Yes, Alzheimers can be hereditary (genetic). […] Your risk of developing Alzheimers disease is 10% to 30% higher if you have a biological parent or sibling with it. […] Researchers dont know why some people get Alzheimers disease and others dont. Some risk factors may include: […] Some health conditions may increase your Alzheimers risk, including: […] The biggest complication of Alzheimers disease is the damage it does to your brain.

• #3 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #4 Alzheimer’s disease – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/symptoms-causes/syc-20350447

  Alzheimer’s disease is the biological process that begins with the appearance of a buildup of proteins in the form of amyloid plaques and neurofibrillary tangles in the brain. […] The exact causes of Alzheimer’s disease aren’t fully understood. But at a basic level, brain proteins don’t function as usual. This disrupts the work of brain cells, also known as neurons, and triggers a series of events. The neurons become damaged and lose connections to each other. They eventually die. […] Scientists believe that for most people, Alzheimer’s disease is caused by a combination of genetic, lifestyle and environmental factors that affect the brain over time. […] The disease begins years before the first symptoms. The damage most often starts in the region of the brain that manages memory. The loss of neurons spreads in a somewhat predictable pattern to other regions of the brain. By the late stage of the disease, the brain has shrunk. […] Researchers trying to understand the cause of Alzheimer’s disease are focused on the role of two proteins: […] In the brain of someone with Alzheimer’s disease, amyloid plaques form and tau proteins change shape and become tangles.

• #5 Alzheimer’s Disease: Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/9164-alzheimers-disease

  Alzheimers disease (AD) is the most common cause of dementia. […] An abnormal build-up of proteins in your brain causes Alzheimers disease. Specifically, two proteins called amyloid and tau. […] When amyloid and tau proteins build up in your brain, they slowly kill neurons. This causes permanent damage that leads to Alzheimers symptoms. […] Experts are still studying Alzheimers disease to learn more about what exactly causes these proteins to build up. […] Yes, Alzheimers can be hereditary (genetic). […] Your risk of developing Alzheimers disease is 10% to 30% higher if you have a biological parent or sibling with it. […] Researchers dont know why some people get Alzheimers disease and others dont. Some risk factors may include: […] Some health conditions may increase your Alzheimers risk, including: […] The biggest complication of Alzheimers disease is the damage it does to your brain.

• #6

  https://www2.hse.ie/conditions/alzheimers-disease/causes/

  Alzheimer’s disease is caused by a build-up of brain protein inside and around brain cells. This damages and eventually kills the brain cells. […] One of these proteins is called amyloid. Amyloid can build up and create plaques around brain cells. The other protein is tau. When tau builds up it can cause tangles inside brain cells. […] It’s not known what causes this process to begin. But it begins many years before symptoms appear. […] Several things can increase your risk of developing Alzheimer’s disease. […] Age is the single most significant factor. The chance of developing Alzheimer’s disease doubles every 5 years after you reach 65. […] Your genes can increase the risk of developing the disease. But the actual increase in risk is small if you have these particular genes. […] In some families, Alzheimer’s disease is caused by the inheritance of a single abnormal gene. In these cases, the risks of it being passed on to children are much higher.

• #7

  https://www2.hse.ie/conditions/alzheimers-disease/causes/

  Alzheimer’s disease is caused by a build-up of brain protein inside and around brain cells. This damages and eventually kills the brain cells. […] One of these proteins is called amyloid. Amyloid can build up and create plaques around brain cells. The other protein is tau. When tau builds up it can cause tangles inside brain cells. […] It’s not known what causes this process to begin. But it begins many years before symptoms appear. […] Several things can increase your risk of developing Alzheimer’s disease. […] Age is the single most significant factor. The chance of developing Alzheimer’s disease doubles every 5 years after you reach 65. […] Your genes can increase the risk of developing the disease. But the actual increase in risk is small if you have these particular genes. […] In some families, Alzheimer’s disease is caused by the inheritance of a single abnormal gene. In these cases, the risks of it being passed on to children are much higher.

• #8 Causes of Alzheimers | Ohio State Medical Center

  https://wexnermedical.osu.edu/brain-spine-neuro/memory-disorders/alzheimers/causes

  Alzheimers disease is caused by an abnormal buildup of certain proteins in the brain. […] Alzheimers disease is thought to be caused by the abnormal buildup of certain proteins inside and outside of brain cells, which make it difficult for the cells to communicate with each other and function properly. […] Experts arent exactly sure why the buildup of proteins occurs, but they suggest genetic, lifestyle and environmental factors play a role. […] While researchers dont fully understand what leads these risk factors to cause the protein buildup inside and outside of brain cells, its believed that the proteins block the brain cells from communicating and functioning properly. […] When looking at the proteins that cause Alzheimers disease, experts have focused on two specific abnormal structures called plaques and tangles. […] Everyone experiences some buildup of these proteins as they age, but someone with Alzheimers disease has far more and they appear in a much more predictable pattern.

• #9 Alzheimer’s Disease | Memory and Aging Center

  https://memory.ucsf.edu/dementia/alzheimer-disease

  Alzheimers disease (AD) is one of several causes of dementia. […] The cause of AD is unknown. Scientists know that in AD there is a large build-up of proteins called amyloid and tau within brain cells. These proteins occur normally, but we do not yet understand why they build up in large amounts. […] The disease process can go on for many years without symptoms, but as more and more proteins form in brain cells, the cells lose their ability to function and eventually die. This causes the affected parts of the brain to shrink.

• #10 Alzheimer’s disease – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/symptoms-causes/syc-20350447

  Alzheimer’s disease is the biological process that begins with the appearance of a buildup of proteins in the form of amyloid plaques and neurofibrillary tangles in the brain. […] The exact causes of Alzheimer’s disease aren’t fully understood. But at a basic level, brain proteins don’t function as usual. This disrupts the work of brain cells, also known as neurons, and triggers a series of events. The neurons become damaged and lose connections to each other. They eventually die. […] Scientists believe that for most people, Alzheimer’s disease is caused by a combination of genetic, lifestyle and environmental factors that affect the brain over time. […] The disease begins years before the first symptoms. The damage most often starts in the region of the brain that manages memory. The loss of neurons spreads in a somewhat predictable pattern to other regions of the brain. By the late stage of the disease, the brain has shrunk. […] Researchers trying to understand the cause of Alzheimer’s disease are focused on the role of two proteins: […] In the brain of someone with Alzheimer’s disease, amyloid plaques form and tau proteins change shape and become tangles.

• #11 What is Dementia? Symptoms, Causes & Treatment | alz.org

  https://www.alz.org/alzheimers-dementia/what-is-dementia

  Dementia is caused by a variety of diseases that cause damage to brain cells. This damage interferes with the ability of brain cells to communicate with each other. When brain cells cannot communicate normally, thinking, behavior and feelings can be affected. […] Different types of dementia are associated with particular types of brain cell damage in particular regions of the brain. For example, in Alzheimer’s disease, high levels of certain proteins inside and outside brain cells make it hard for brain cells to stay healthy and to communicate with each other. The brain region called the hippocampus is the center of learning and memory in the brain, and the brain cells in this region are often the first to be damaged. That’s why memory loss is often one of the earliest symptoms of Alzheimer’s.

• #12 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  In most cases, Alzheimers does not have a single genetic cause. Instead, it can be influenced by multiple genes in combination with lifestyle and environmental factors. […] Importantly, people who develop Alzheimers do not always have a history of the disease in their families. Still, those who have a parent or sibling diagnosed with the disease have a higher risk of developing Alzheimers than those who dont have a close relative with the disease. […] One well-known gene that influences Alzheimers risk is the apolipoprotein E (APOE) gene. […] Problems in this process may contribute to the development of Alzheimers. […] Of the genetic variants associated with Alzheimers so far, rare variants in three genes are known to cause the disease: Amyloid precursor protein (APP) on chromosome 21, Presenilin 1 (PSEN1) on chromosome 14, Presenilin 2 (PSEN2) on chromosome 1.

• #13 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  Late-onset Alzheimer’s is about 70% heritable. […] The strongest genetic risk factor for sporadic Alzheimer’s disease is APOE4. […] Only 12% of Alzheimer’s cases are inherited due to autosomal dominant effects, as Alzheimer’s is highly polygenic. […] Early onset familial Alzheimer’s disease can be attributed to mutations in one of three genes: those encoding amyloid-beta precursor protein (APP) and presenilins PSEN1 and PSEN2. […] Alleles in the TREM2 gene have been associated with a three to five times higher risk of developing Alzheimer’s disease. […] The tau hypothesis proposes that tau protein abnormalities initiate the disease cascade. […] A number of studies connect the misfolded amyloid beta and tau proteins associated with the pathology of Alzheimer’s disease, as bringing about oxidative stress that leads to neuroinflammation.

• #14 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  In most cases, Alzheimers does not have a single genetic cause. Instead, it can be influenced by multiple genes in combination with lifestyle and environmental factors. […] Importantly, people who develop Alzheimers do not always have a history of the disease in their families. Still, those who have a parent or sibling diagnosed with the disease have a higher risk of developing Alzheimers than those who dont have a close relative with the disease. […] One well-known gene that influences Alzheimers risk is the apolipoprotein E (APOE) gene. […] Problems in this process may contribute to the development of Alzheimers. […] Of the genetic variants associated with Alzheimers so far, rare variants in three genes are known to cause the disease: Amyloid precursor protein (APP) on chromosome 21, Presenilin 1 (PSEN1) on chromosome 14, Presenilin 2 (PSEN2) on chromosome 1.

• #15 Alzheimer’s disease: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/alzheimers-disease/

  Alzheimer’s disease can be classified as early-onset or late-onset. The signs and symptoms of the early-onset form appear between a person’s thirties and mid-sixties, while the late-onset form appears during or after a person’s mid-sixties. The early-onset form of Alzheimer’s disease is much less common than the late-onset form, accounting for less than 10 percent of all cases of Alzheimer’s disease. […] Some cases of early-onset Alzheimer’s disease are caused by gene variants (also called mutations) that can be passed from parent to child. This results in what is known as early-onset familial Alzheimer’s disease (FAD). Researchers have found that this form of the disorder can result from variants in the APP, PSEN1, or PSEN2 genes. When any of these genes is altered, large amounts of a toxic protein fragment called amyloid beta peptide are produced in the brain. This peptide can build up in the brain to form clumps called amyloid plaques, which are characteristic of Alzheimer’s disease. A buildup of toxic amyloid beta peptide and amyloid plaques may lead to the death of nerve cells and the progressive signs and symptoms of this disorder.

• #16 Alzheimer Disease: Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1134817-overview

  Mutations in the following genes unequivocally cause early-onset autosomal dominant AD: The amyloid precursor protein (APP) gene on chromosome 21, The presenilin-1 (PS1) gene on chromosome 14, The presenilin-2 (PS2) gene on chromosome 1. […] All 3 of these genes lead to a relative excess in the production of the stickier 42-amino acid form of the Ab peptide over the less sticky 40-amino-acid form. […] This beta-pleated peptide is postulated to have neurotoxic properties and to lead to a cascade of events (as yet incompletely understood) that results in neuronal death, synapse loss, and the formation of NFTs and SPs, among other lesions. […] Other than the apolipoprotein E epsilon 4 (APOE E4) genotype, no polymorphisms in other genes have been consistently found to be associated with late-onset AD.

• #17 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  Other genes known to have variants associated with AD risk include TREM2, APOE, CLU, SORL1, BIN1 and PICALM. APOE (apolipoprotein E) is a protein involved in fat metabolism, and its E4 allele is the most common genetic risk factor for AD with an allele frequency of ~13.7%. Heterozygosity for this allele increases the risk 3-fold. […] Sporadic AD often results from a combination of genetic and environmental risk factors, with cerebral hypoperfusion and inflammation being among the most common. Inflammation due to trauma, sepsis and infection has been linked to both short- and long-term cognitive impairment. […] There is a strong link between vascular disease and dementia. Cardiovascular disease, including high blood pressure and heart attack, and cerebrovascular disease such as ischemia are associated with increased risk of AD. Metabolic and lifestyle risk factors for developing vascular diseases, including poor diet, obesity, high cholesterol and sedentary lifestyle, are also risk factors for dementia.

• #18 Alzheimer Disease – Neurologic Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/neurologic-disorders/delirium-and-dementia/alzheimer-disease

  Other genetic determinants include the apolipoprotein (apo) E (epsilon) alleles. Apo E proteins influence beta-amyloid deposition, cytoskeletal integrity, and efficiency of neuronal repair. Risk of Alzheimer disease is substantially increased (up to15-fold) in people with 2 epsilon-4 alleles (ApoE4) and may be decreased in those who have the epsilon-2 allele. […] Vascular risk factors, such as hypertension, diabetes, dyslipidemia, and smoking, can increase the risk of Alzheimer disease. […] The relationship of other factors, such as low estrogen levels and heavy metal exposure, to Alzheimer disease has not been established.

• #19 What causes Alzheimer’s disease? What we know, don’t know and suspect

  https://theconversation.com/what-causes-alzheimers-disease-what-we-know-dont-know-and-suspect-75847

  The accumulation of amyloid protein in the brain is mainly found in Alzheimers disease, along with the way it spreads. […] However, people who carry these mutations have a 99.9% chance of developing the disease, and a 50% chance of passing the mutations to their children. […] Age is the greatest risk factor for sporadic Alzheimers disease (which accounts for 99% of Alzheimers disease cases). […] The strongest genetic risk factor for sporadic Alzheimers disease is a gene called apolipoprotein E (APOE) 4, and emerging research suggests this increased risk may be due to inefficiencies in clearing amyloid from the brain. […] Some evidence links type 2 diabetes with risk of Alzheimers disease. […] A recent paper suggests low BMI does not cause Alzheimers disease but that lower BMI may arise as a result of brain changes, such as appetite suppression, that occur early due to the disease.

• #20 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  Other genes known to have variants associated with AD risk include TREM2, APOE, CLU, SORL1, BIN1 and PICALM. APOE (apolipoprotein E) is a protein involved in fat metabolism, and its E4 allele is the most common genetic risk factor for AD with an allele frequency of ~13.7%. Heterozygosity for this allele increases the risk 3-fold. […] Sporadic AD often results from a combination of genetic and environmental risk factors, with cerebral hypoperfusion and inflammation being among the most common. Inflammation due to trauma, sepsis and infection has been linked to both short- and long-term cognitive impairment. […] There is a strong link between vascular disease and dementia. Cardiovascular disease, including high blood pressure and heart attack, and cerebrovascular disease such as ischemia are associated with increased risk of AD. Metabolic and lifestyle risk factors for developing vascular diseases, including poor diet, obesity, high cholesterol and sedentary lifestyle, are also risk factors for dementia.

• #21 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #22 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Alzheimers disease is a brain disorder that slowly destroys memory and thinking skills, and eventually, the ability to carry out the simplest tasks. […] In recent years, scientists have made tremendous progress in understanding Alzheimers. Still, they dont yet fully understand what causes the disease in most people. The causes probably include a combination of age-related changes in the brain, along with genetic, health, and lifestyle factors. […] Age is the biggest known risk factor for Alzheimers. Most people with Alzheimers develop the disease when they are 65 or older, with less than 10% of cases occurring before then. […] Research on normal brain aging is exploring this question. For example, scientists are learning how age-related changes in the brain may harm neurons and affect other types of brain cells to contribute to Alzheimers damage.

• #23 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #24 What Is Alzheimer’s Disease?

  https://www.alzheimers.gov/alzheimers-dementias/alzheimers-disease

  Alzheimers disease is a brain disorder that slowly destroys memory and thinking skills and, eventually, the ability to carry out the simplest tasks. […] The causes of Alzheimers disease are not yet fully understood, but probably include a combination of: […] Age-related changes in the brain, like shrinking, inflammation, blood vessel damage, and breakdown of energy within cells, which may harm neurons and affect other brain cells. […] Changes or differences in genes, which may be passed down by a family member. […] Health, environmental, and lifestyle factors that may play a role, such as exposure to pollutants, heart disease, stroke, high blood pressure, diabetes, and obesity. […] Alzheimers disease is not a normal part of aging. Its the result of complex changes in the brain that start years before symptoms appear and lead to the loss of brain cells and their connections.

• #25 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Alzheimers disease is a brain disorder that slowly destroys memory and thinking skills, and eventually, the ability to carry out the simplest tasks. […] In recent years, scientists have made tremendous progress in understanding Alzheimers. Still, they dont yet fully understand what causes the disease in most people. The causes probably include a combination of age-related changes in the brain, along with genetic, health, and lifestyle factors. […] Age is the biggest known risk factor for Alzheimers. Most people with Alzheimers develop the disease when they are 65 or older, with less than 10% of cases occurring before then. […] Research on normal brain aging is exploring this question. For example, scientists are learning how age-related changes in the brain may harm neurons and affect other types of brain cells to contribute to Alzheimers damage.

• #26 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  Other genes known to have variants associated with AD risk include TREM2, APOE, CLU, SORL1, BIN1 and PICALM. APOE (apolipoprotein E) is a protein involved in fat metabolism, and its E4 allele is the most common genetic risk factor for AD with an allele frequency of ~13.7%. Heterozygosity for this allele increases the risk 3-fold. […] Sporadic AD often results from a combination of genetic and environmental risk factors, with cerebral hypoperfusion and inflammation being among the most common. Inflammation due to trauma, sepsis and infection has been linked to both short- and long-term cognitive impairment. […] There is a strong link between vascular disease and dementia. Cardiovascular disease, including high blood pressure and heart attack, and cerebrovascular disease such as ischemia are associated with increased risk of AD. Metabolic and lifestyle risk factors for developing vascular diseases, including poor diet, obesity, high cholesterol and sedentary lifestyle, are also risk factors for dementia.

• #27 What causes Alzheimer’s disease? | Paris Brain Institute

  https://parisbraininstitute.org/disease-files/alzheimers-disease/what-causes-alzheimers-disease

  Although Alzheimer’s disease is not hereditary (except in 1% of cases), it has been shown that there are genetic predisposing factors, i.e. factors that increase the risk of developing the disease. Previous studies have shown in particular that people carrying a particular allele of the APOE gene, APOEe4, have a risk 3 to 15 times higher than non-carriers, but also that some Alzheimer’s patients do not carry this allele. […] It now remains to be determined whether the health problems encountered are risk factors or symptoms or warning signs of the disease.

• #28 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  Other genes known to have variants associated with AD risk include TREM2, APOE, CLU, SORL1, BIN1 and PICALM. APOE (apolipoprotein E) is a protein involved in fat metabolism, and its E4 allele is the most common genetic risk factor for AD with an allele frequency of ~13.7%. Heterozygosity for this allele increases the risk 3-fold. […] Sporadic AD often results from a combination of genetic and environmental risk factors, with cerebral hypoperfusion and inflammation being among the most common. Inflammation due to trauma, sepsis and infection has been linked to both short- and long-term cognitive impairment. […] There is a strong link between vascular disease and dementia. Cardiovascular disease, including high blood pressure and heart attack, and cerebrovascular disease such as ischemia are associated with increased risk of AD. Metabolic and lifestyle risk factors for developing vascular diseases, including poor diet, obesity, high cholesterol and sedentary lifestyle, are also risk factors for dementia.

• #29 Alzheimer’s disease: risk factors and potentially protective measures | Journal of Biomedical Science | Full Text

  https://jbiomedsci.biomedcentral.com/articles/10.1186/s12929-019-0524-y

  A number of acquired factors increase the risk of developing AD. Among those factors are cerebrovascular diseases (most commonly reported risk factor), diabetes, hypertension, obesity and dyslipidemia. […] The exact mechanism by which deposition of A peptide promotes NFT formation of hyperphosphorylated tau protein is not known. […] The A peptide promotes the activation of specific kinases (GSK3, e.g.) that catalyze the hyperphosphorylation of tau protein, leading to its conformation change and formation of NFT. […] Studies demonstrate that cerebral ischemia is capable of leading to the accumulation of APP and A, in addition to stimulating the expression of presenilin, involved in A synthesis.

• #30 Causes and Risk Factors for Alzheimer’s Disease

  https://www.healthline.com/health/alzheimers-disease-risk-factors

  Researchers do not believe Alzheimers disease has one specific cause. Instead, a combination of genetic, environmental, and lifestyle risk factors can contribute to the condition. […] Researchers are still not sure exactly what causes Alzheimers disease, but certain factors can increase your likelihood of developing this incurable disease. […] High blood pressure may increase your risk of developing Alzheimers. According to a 2010 research review, having high blood pressure in middle age is associated with a greater chance of developing Alzheimers than having high blood pressure later in life. […] In a study with more than 10,000 participants that was published in 2007, researchers found that a body mass index (BMI) of 25 or greater (overweight) was associated with double the risk of developing Alzheimers, and a BMI of 30 or greater (obesity) was associated with triple the risk.

• #31 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  The cellular homeostasis of biometals such as ionic copper, iron, and zinc is disrupted in Alzheimer’s disease, though it remains unclear whether this is produced by or causes the changes in proteins. […] The association with celiac disease is unclear, with a 2019 study finding no increase in dementia overall in those with celiac disease while a 2018 review found an association with several types of dementia including Alzheimer’s disease. […] Studies have shown a potential link between infection with certain viruses and developing Alzheimer’s disease later in life. […] Some evidence suggests that some viral infections such as Herpes simplex virus 1 (HSV-1) may be associated with dementia, but there are conflicting results and the association with Alzheimer’s is unclear as of 2024. […] Some researchers have proposed that Alzheimer’s disease is Type 3 diabetes because of a number of correspondences with both Type 1 and Type 2 diabetes.

• #32 What causes Alzheimer’s disease? What we know, don’t know and suspect

  https://theconversation.com/what-causes-alzheimers-disease-what-we-know-dont-know-and-suspect-75847

  Some studies have also suggested Alzheimers disease can be known as type 3 diabetes, as patients show poorer energy consumption in the brain. […] Sleep disturbance may be an early indicator of Alzheimers disease. […] Earlier-life depression has been associated with a doubled risk of developing dementia. […] Some people with high amyloid in their brains do not develop Alzheimers disease. […] While a cure continues to elude us, many Alzheimers experts now realise early diagnosis and intervention is key to stopping the disease in its tracks. […] If brain shrinkage has already begun, removing amyloid from the brain is unlikely to be effective.

• #33 Causes and Risk Factors for Alzheimer’s Disease

  https://www.healthline.com/health/alzheimers-disease-risk-factors

  Researchers do not believe Alzheimers disease has one specific cause. Instead, a combination of genetic, environmental, and lifestyle risk factors can contribute to the condition. […] Researchers are still not sure exactly what causes Alzheimers disease, but certain factors can increase your likelihood of developing this incurable disease. […] High blood pressure may increase your risk of developing Alzheimers. According to a 2010 research review, having high blood pressure in middle age is associated with a greater chance of developing Alzheimers than having high blood pressure later in life. […] In a study with more than 10,000 participants that was published in 2007, researchers found that a body mass index (BMI) of 25 or greater (overweight) was associated with double the risk of developing Alzheimers, and a BMI of 30 or greater (obesity) was associated with triple the risk.

• #34 Alzheimer Disease – Neurologic Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/neurologic-disorders/delirium-and-dementia/alzheimer-disease

  Other genetic determinants include the apolipoprotein (apo) E (epsilon) alleles. Apo E proteins influence beta-amyloid deposition, cytoskeletal integrity, and efficiency of neuronal repair. Risk of Alzheimer disease is substantially increased (up to15-fold) in people with 2 epsilon-4 alleles (ApoE4) and may be decreased in those who have the epsilon-2 allele. […] Vascular risk factors, such as hypertension, diabetes, dyslipidemia, and smoking, can increase the risk of Alzheimer disease. […] The relationship of other factors, such as low estrogen levels and heavy metal exposure, to Alzheimer disease has not been established.

• #35 Causes and Risk Factors for Alzheimer’s Disease

  https://www.healthline.com/health/alzheimers-disease-risk-factors

  A low level of physical activity has been linked to dementia and Alzheimers disease. […] Mental activity might be as important as physical activity for decreasing your risk of Alzheimers disease. […] A heart-healthy diet may benefit cognitive function, according to the Alzheimers Association. […] Alzheimers is not a natural part of growing older, but older age is a risk factor for developing it. […] Women outnumber men when it comes to Alzheimers. […] Researchers have found two classes of genes related to Alzheimers: deterministic genes and risk genes. […] Alzheimers often runs in families. […] Scientists have identified brain abnormalities in people who are likely to later develop Alzheimers. […] Its not possible to prevent Alzheimers because its exact causes are not well understood. However, eating a heart-healthy diet, exercising, engaging in mentally challenging activities, lowering your blood pressure, and protecting your head during physical activities such as contact sports may lower your risk.

• #36 Alzheimer’s disease: risk factors and potentially protective measures | Journal of Biomedical Science | Full Text

  https://jbiomedsci.biomedcentral.com/articles/10.1186/s12929-019-0524-y

  A number of acquired factors increase the risk of developing AD. Among those factors are cerebrovascular diseases (most commonly reported risk factor), diabetes, hypertension, obesity and dyslipidemia. […] The exact mechanism by which deposition of A peptide promotes NFT formation of hyperphosphorylated tau protein is not known. […] The A peptide promotes the activation of specific kinases (GSK3, e.g.) that catalyze the hyperphosphorylation of tau protein, leading to its conformation change and formation of NFT. […] Studies demonstrate that cerebral ischemia is capable of leading to the accumulation of APP and A, in addition to stimulating the expression of presenilin, involved in A synthesis.

• #37 Are some cases of Alzheimer’s disease caused by infection? – Harvard Health

  https://www.health.harvard.edu/mind-and-mood/are-some-cases-of-alzheimers-disease-caused-by-infection

  Amyloid-beta probably is the most important molecule. It shows up earlier than tau. And Tanzi and others have shown that people who inherit a gene that leads them to have high levels of amyloid-beta develop Alzheimer’s at a relatively young age. People who inherit two copies of the APOE4 gene variant are at even greater risk of developing Alzheimer’s, because they are less able to clear amyloid-beta out of the brain. […] Inflammation in the brain (neuroinflammation) is increasingly accepted as an important factor in Alzheimer’s. In neuroinflammation, the brain’s own immune system cells fight invading microbes or work to heal injury. Unfortunately, that also can cause injury, leading to more neuroinflammation a vicious cycle that ultimately causes most of the death of neurons. […] Both amyloid-beta plaques and tau tangles can trigger neuroinflammation, and so can many microbes (bacteria and viruses). Some microbes can infect the brain and remain there without being completely eradicated by the brain’s immune system, potentially leading to chronic, low-grade neuroinflammation. Even infections or other causes of inflammation outside of the brain, anywhere in the body, can send signals to the brain that trigger neuroinflammation.

• #38 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  Other genes known to have variants associated with AD risk include TREM2, APOE, CLU, SORL1, BIN1 and PICALM. APOE (apolipoprotein E) is a protein involved in fat metabolism, and its E4 allele is the most common genetic risk factor for AD with an allele frequency of ~13.7%. Heterozygosity for this allele increases the risk 3-fold. […] Sporadic AD often results from a combination of genetic and environmental risk factors, with cerebral hypoperfusion and inflammation being among the most common. Inflammation due to trauma, sepsis and infection has been linked to both short- and long-term cognitive impairment. […] There is a strong link between vascular disease and dementia. Cardiovascular disease, including high blood pressure and heart attack, and cerebrovascular disease such as ischemia are associated with increased risk of AD. Metabolic and lifestyle risk factors for developing vascular diseases, including poor diet, obesity, high cholesterol and sedentary lifestyle, are also risk factors for dementia.

• #39 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  The cellular homeostasis of biometals such as ionic copper, iron, and zinc is disrupted in Alzheimer’s disease, though it remains unclear whether this is produced by or causes the changes in proteins. […] The association with celiac disease is unclear, with a 2019 study finding no increase in dementia overall in those with celiac disease while a 2018 review found an association with several types of dementia including Alzheimer’s disease. […] Studies have shown a potential link between infection with certain viruses and developing Alzheimer’s disease later in life. […] Some evidence suggests that some viral infections such as Herpes simplex virus 1 (HSV-1) may be associated with dementia, but there are conflicting results and the association with Alzheimer’s is unclear as of 2024. […] Some researchers have proposed that Alzheimer’s disease is Type 3 diabetes because of a number of correspondences with both Type 1 and Type 2 diabetes.

• #40 Are some cases of Alzheimer’s disease caused by infection? – Harvard Health

  https://www.health.harvard.edu/mind-and-mood/are-some-cases-of-alzheimers-disease-caused-by-infection

  Some scientists believe infection might do more than cause neuroinflammation. Infection might also play a role in igniting amyloid-beta deposits and tau tangles. „My colleague, the late Rob Moir, and I found that amyloid-beta is deposited in the brain in response to infection. It is a protein that defends against infection: it forms a web that entraps invading microbes,” Tanzi says. „In other words, amyloid-beta helps protect our brain from infection. That’s the good news. The bad news is that amyloid-beta also damages neurons which, over 10 to 30 years, starts to have obvious effects on cognition, ultimately leading to dementia.” […] In addition, the chronic low-grade deposition of amyloid-beta leads to tau tangles that also kill neurons and further increase neuroinflammation, which leads to more neuron death. Vicious cycles can develop and be very hard to stop.

• #41 Comprehensive Review on Alzheimer’s Disease: Causes and Treatment

  https://www.mdpi.com/1420-3049/25/24/5789

  Environmental risk factors including air pollution, diet, metals, infections, and many others may induce oxidative stress and inflammation and increase the risk for developing AD. […] Chronic infections to the central nervous system (CNS) can cause an accumulation of Aβ plaques and NFT, therefore, they are included among the risk factors in AD.

• #42 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  The cellular homeostasis of biometals such as ionic copper, iron, and zinc is disrupted in Alzheimer’s disease, though it remains unclear whether this is produced by or causes the changes in proteins. […] The association with celiac disease is unclear, with a 2019 study finding no increase in dementia overall in those with celiac disease while a 2018 review found an association with several types of dementia including Alzheimer’s disease. […] Studies have shown a potential link between infection with certain viruses and developing Alzheimer’s disease later in life. […] Some evidence suggests that some viral infections such as Herpes simplex virus 1 (HSV-1) may be associated with dementia, but there are conflicting results and the association with Alzheimer’s is unclear as of 2024. […] Some researchers have proposed that Alzheimer’s disease is Type 3 diabetes because of a number of correspondences with both Type 1 and Type 2 diabetes.

• #43 We may finally know what causes Alzheimer’s – and how to stop it | New Scientist

  https://www.newscientist.com/article/2191814-we-may-finally-know-what-causes-alzheimers-and-how-to-stop-it/

  AFTER decades of disappointment, we may have a new lead on fighting Alzheimers disease. Compelling evidence that the condition is caused by a bacterium involved in gum disease could prove a game-changer in tackling one of medicines biggest mysteries, and lead to effective treatments or even a vaccine. […] The bacteria in the brain are not the result of Alzheimers, but they could be the cause. […] Multiple teams have been researching Porphyromonas gingivalis, the main bacterium involved in gum disease, which is a known risk factor for Alzheimers. […] When the team gave P. gingivalis gum disease to mice, it led to brain infection, amyloid production, tangles of tau protein and neural damage in the regions and nerves normally affected by Alzheimers. This suggests causation, says Lynch. […] The study does address most of Kochs postulates, says Robert Genco of the University at Buffalo, New York. Future studies need to be in humans to be convincing.

• #44 Risk Factors for Alzheimer’s Disease

  https://www.webmd.com/alzheimers/alzheimers-causes-risk-factors

  But many studies since then have failed to confirm a connection. […] Several viruses have been linked to an increased risk of Alzheimers. […] A recent study found that people with viral encephalitis (brain swelling caused by a viral infection) were 30 times more likely to get Alzheimers. […] Its not clear what exactly causes Alzheimers, but several things increase your risk of it. […] Experts arent sure exactly what causes some people to get Alzheimers. But some of the most well-known risk factors include older age, your genes, and poor heart health.

• #45 Are some cases of Alzheimer’s disease caused by infection? – Harvard Health

  https://www.health.harvard.edu/mind-and-mood/are-some-cases-of-alzheimers-disease-caused-by-infection

  Some scientists believe infection might do more than cause neuroinflammation. Infection might also play a role in igniting amyloid-beta deposits and tau tangles. „My colleague, the late Rob Moir, and I found that amyloid-beta is deposited in the brain in response to infection. It is a protein that defends against infection: it forms a web that entraps invading microbes,” Tanzi says. „In other words, amyloid-beta helps protect our brain from infection. That’s the good news. The bad news is that amyloid-beta also damages neurons which, over 10 to 30 years, starts to have obvious effects on cognition, ultimately leading to dementia.” […] In addition, the chronic low-grade deposition of amyloid-beta leads to tau tangles that also kill neurons and further increase neuroinflammation, which leads to more neuron death. Vicious cycles can develop and be very hard to stop.

• #46 Alzheimer disease | Definition, Causes, Symptoms, & Treatment | Britannica

  https://www.britannica.com/science/Alzheimer-disease

  Research in animals suggests that amyloid-beta plaques form naturally in the brain in response to infection, serving to entrap microorganisms. The idea that amyloid beta serves as a natural antibiotic implies that Alzheimer disease may be in some way linked to brain infection, plaque formation being either excessive in older individuals or abnormal in some other way in persons who eventually develop Alzheimer disease. […] Abnormal insulin signaling in the brain has been associated with Alzheimer disease. […] A defect in a gene known as APP, which codes for amyloid precursor protein, may increase the production or deposition of amyloid beta, which forms the core of neuritic plaques. […] A defect in the gene that directs production of apolipoprotein E (ApoE), which is involved in cholesterol transport, may be a factor in the majority of late-onset Alzheimer cases.

• #47

  https://www.nhs.uk/conditions/alzheimers-disease/causes/

  Alzheimer’s disease is thought to be caused by the abnormal build-up of proteins in and around brain cells. […] Although it’s not known exactly what causes this process to begin, scientists now know that it begins many years before symptoms appear. […] Although it’s still unknown what triggers Alzheimer’s disease, several factors are known to increase your risk of developing the condition. […] The genes you inherit from your parents can contribute to your risk of developing Alzheimer’s disease, although the actual increase in risk is small. […] People with Down’s syndrome are at a higher risk of developing Alzheimer’s disease. […] People who have had a severe head injury may be at higher risk of developing Alzheimer’s disease, but much research is still needed in this area. […] Research shows that several lifestyle factors and conditions associated with cardiovascular disease can increase the risk of Alzheimer’s disease. […] In addition, the latest research suggests that other factors are also important, although this does not mean these factors are directly responsible for causing dementia.

• #48

  https://www2.hse.ie/conditions/alzheimers-disease/causes/

  People with Down syndrome have a much higher risk of developing Alzheimer’s disease. […] The genetic abnormality that causes Down syndrome also causes a build-up of amyloid. This leads to Alzheimer’s disease in most people with Down syndrome. […] People who have had a severe head injury may be at higher risk of developing Alzheimer’s disease. […] Many lifestyle factors linked with cardiovascular disease can increase your risk. […] It is not your fault if you get Alzheimer’s disease. In most cases, it is caused by a combination of genetics, lifestyle, environment, and old age.

• #49 Top Causes and Risk Factors of Alzheimer’s Disease

  https://www.everydayhealth.com/alzheimers-disease/causes-risk-factors/

  Over the past three decades, scientists have identified a link between moderate and severe traumatic brain injury and an increased risk of Alzheimers disease or another dementia developing years later. […] Some studies have found an association between severe traumatic head injuries and elevated levels of the protein beta-amyloid in the brain, a characteristic of Alzheimers disease. […] Researchers have found encouraging evidence that healthy habits can protect the brain and reduce the risk of Alzheimers disease.

• #50 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  The list of environmental and metabolic risk factors discussed here is not intended to be comprehensive, especially as the nature of epidemiology in populations with diverse genetics and lifestyle means that important mechanisms will not always generate conclusive evidence. Other risk factors implicated include pollution, stress and heavy metal exposure.

• #51 Causes of Alzheimer’s Disease | Alzheimer’s News TodayEnvelope icon

  https://alzheimersnewstoday.com/alzheimers-disease-causes/

  Aging is the greatest risk factor involved in Alzheimer’s, as cases generally develop later in life. […] Various studies have found associations between air pollution and Alzheimer’s. […] Certain lifestyle choices are linked to varying risks for Alzheimer’s and related dementias. […] Certain metabolic disorders, including Cushing’s disease, porphyria, and type 2 diabetes, contribute to abnormal brain function. […] Related to genetic risk factors, people with Down syndrome have a partial third copy of chromosome 21 (usually there are two copies of each chromosome) and a higher risk for Alzheimer’s disease.

• #52 Alzheimer’s Disease: Causes, Symptoms, Stages, Treatments & Prevention

  https://www.healthday.com/a-to-z-health/neurology/alzheimers-disease-what-it-is-causes-symptoms-stages-treatments-prevention

  Some other risk factors for Alzheimers include the following. […] People 50 years of age and older who suffer a traumatic brain injury (TBI) are at an increased risk for dementia and Alzheimers. […] Some animal research has linked exposure to air pollutants such as traffic exhaust and burning wood to the risk of dementia, but more research is needed. […] Drinking excessive amounts of alcohol may cause brain changes. These brain changes may increase the risk for dementia, particularly early-onset dementia. […] Some of the risk factors associated with heart disease may also be the same for Alzheimers. […] Research has shown that people who dont stimulate their brains or engage with others are more likely to develop Alzheimers.

• #53 Risk Factors for Alzheimer’s Disease

  https://www.webmd.com/alzheimers/alzheimers-causes-risk-factors

  Alzheimers disease is most likely caused by a mix of your genes, your lifestyle, and things in your environment. […] Dementia is not part of normal aging. But the older you get, the more likely you are to have it. Your risk starts increasing around age 65. […] Most people have two copies of each chromosome (string of genes), but people with Down syndrome have three copies of chromosome 21. […] People who have a traumatic brain injury after age 50 are more likely to develop Alzheimers. […] People with high cholesterol are more likely to get Alzheimers. […] High blood pressure is when the force of blood pushing against the walls of your arteries, like water in a hose, is too high. […] A study in rabbits in the 1960s found that those that got shots containing very high doses of aluminum developed protein tangles in their brains.

• #54 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  The list of environmental and metabolic risk factors discussed here is not intended to be comprehensive, especially as the nature of epidemiology in populations with diverse genetics and lifestyle means that important mechanisms will not always generate conclusive evidence. Other risk factors implicated include pollution, stress and heavy metal exposure.

• #55 Causes and Risk Factors for Alzheimer’s Disease

  https://www.healthline.com/health/alzheimers-disease-risk-factors

  A low level of physical activity has been linked to dementia and Alzheimers disease. […] Mental activity might be as important as physical activity for decreasing your risk of Alzheimers disease. […] A heart-healthy diet may benefit cognitive function, according to the Alzheimers Association. […] Alzheimers is not a natural part of growing older, but older age is a risk factor for developing it. […] Women outnumber men when it comes to Alzheimers. […] Researchers have found two classes of genes related to Alzheimers: deterministic genes and risk genes. […] Alzheimers often runs in families. […] Scientists have identified brain abnormalities in people who are likely to later develop Alzheimers. […] Its not possible to prevent Alzheimers because its exact causes are not well understood. However, eating a heart-healthy diet, exercising, engaging in mentally challenging activities, lowering your blood pressure, and protecting your head during physical activities such as contact sports may lower your risk.

• #56 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Research suggests that a host of factors beyond age and genetics may play a role in the development and course of Alzheimers. […] Scientists are also looking at the role of metabolic diseases, such as diabetes and obesity. […] In addition, other medical conditions associated with a higher risk of Alzheimers include: Hearing loss, Depression, Mild cognitive impairment, Concussion or other traumatic brain injury. […] However, there may be ways to promote better brain health and reduce your risk of Alzheimers by addressing certain lifestyle factors. […] Researchers cannot yet say for certain whether making positive changes in these areas can prevent dementia, but doing so is beneficial to living a healthier lifestyle overall.

• #57 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Scientists know genes are involved in Alzheimers. Two categories of genes influence whether a person develops a disease: risk genes and deterministic genes. Alzheimer’s genes have been found in both categories. It is estimated that less than 1% of Alzheimers cases are caused by deterministic genes (genes that cause a disease, rather than increase the risk of developing a disease). […] There is a link between head injury and future risk of dementia. […] The risk of developing dementia appears to be increased by many conditions that also are not good for our hearts, including high blood pressure and diabetes. […] Research shows that older Latinos are about one-and-a-half times as likely as older whites to have Alzheimers and other dementias, while older African Americans are about twice as likely to have the disease as older whites. The reason for these differences is not well understood, but researchers believe that higher rates of vascular disease in these groups may also put them at greater risk for developing Alzheimers.

• #58

  https://www.nhs.uk/conditions/alzheimers-disease/causes/

  Alzheimer’s disease is thought to be caused by the abnormal build-up of proteins in and around brain cells. […] Although it’s not known exactly what causes this process to begin, scientists now know that it begins many years before symptoms appear. […] Although it’s still unknown what triggers Alzheimer’s disease, several factors are known to increase your risk of developing the condition. […] The genes you inherit from your parents can contribute to your risk of developing Alzheimer’s disease, although the actual increase in risk is small. […] People with Down’s syndrome are at a higher risk of developing Alzheimer’s disease. […] People who have had a severe head injury may be at higher risk of developing Alzheimer’s disease, but much research is still needed in this area. […] Research shows that several lifestyle factors and conditions associated with cardiovascular disease can increase the risk of Alzheimer’s disease. […] In addition, the latest research suggests that other factors are also important, although this does not mean these factors are directly responsible for causing dementia.

• #59

  https://www2.hse.ie/conditions/alzheimers-disease/causes/

  People with Down syndrome have a much higher risk of developing Alzheimer’s disease. […] The genetic abnormality that causes Down syndrome also causes a build-up of amyloid. This leads to Alzheimer’s disease in most people with Down syndrome. […] People who have had a severe head injury may be at higher risk of developing Alzheimer’s disease. […] Many lifestyle factors linked with cardiovascular disease can increase your risk. […] It is not your fault if you get Alzheimer’s disease. In most cases, it is caused by a combination of genetics, lifestyle, environment, and old age.

• #60 What causes Alzheimer’s disease? What we know, don’t know and suspect

  https://theconversation.com/what-causes-alzheimers-disease-what-we-know-dont-know-and-suspect-75847

  Some studies have also suggested Alzheimers disease can be known as type 3 diabetes, as patients show poorer energy consumption in the brain. […] Sleep disturbance may be an early indicator of Alzheimers disease. […] Earlier-life depression has been associated with a doubled risk of developing dementia. […] Some people with high amyloid in their brains do not develop Alzheimers disease. […] While a cure continues to elude us, many Alzheimers experts now realise early diagnosis and intervention is key to stopping the disease in its tracks. […] If brain shrinkage has already begun, removing amyloid from the brain is unlikely to be effective.

• #61 Alzheimer Disease: Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1134817-overview

  Depression has been identified as a risk factor for AD and other dementias. […] Moderate to severe head trauma has been documented as a risk factor for the development of AD as well as other forms of dementia later in life. […] Epigenetics is a change in gene expression that results from gene-environment interactions.

• #62 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Research suggests that a host of factors beyond age and genetics may play a role in the development and course of Alzheimers. […] Scientists are also looking at the role of metabolic diseases, such as diabetes and obesity. […] In addition, other medical conditions associated with a higher risk of Alzheimers include: Hearing loss, Depression, Mild cognitive impairment, Concussion or other traumatic brain injury. […] However, there may be ways to promote better brain health and reduce your risk of Alzheimers by addressing certain lifestyle factors. […] Researchers cannot yet say for certain whether making positive changes in these areas can prevent dementia, but doing so is beneficial to living a healthier lifestyle overall.

• #63 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Research suggests that a host of factors beyond age and genetics may play a role in the development and course of Alzheimers. […] Scientists are also looking at the role of metabolic diseases, such as diabetes and obesity. […] In addition, other medical conditions associated with a higher risk of Alzheimers include: Hearing loss, Depression, Mild cognitive impairment, Concussion or other traumatic brain injury. […] However, there may be ways to promote better brain health and reduce your risk of Alzheimers by addressing certain lifestyle factors. […] Researchers cannot yet say for certain whether making positive changes in these areas can prevent dementia, but doing so is beneficial to living a healthier lifestyle overall.

• #64 Causes and Risk Factors of Alzheimer’s Disease

  https://www.health.com/alzheimers-disease-causes-7092835

  About 70% of Alzheimer’s disease cases are related to genetic factors. […] The gene that can most affect your risk of late-onset Alzheimer’s is apolipoprotein E (APOE). […] Researchers have identified different conditions, injuries, and other circumstances that can also contribute to the development of Alzheimer’s disease. […] These conditions include high blood pressure (hypertension), heart disease, and stroke. […] In particular, experiencing high LDL cholesterol levels and obesity during your midlife can increase your Alzheimer’s risk. […] Depression can raise your risk of Alzheimer’s. […] Social isolation means lacking social interaction. Loneliness is different—it’s feeling alone or separated, which can happen even when you’re around other people. Both are risk factors for Alzheimer’s disease.

• #65 Alzheimer’s Disease: Causes, Symptoms, Stages, Treatments & Prevention

  https://www.healthday.com/a-to-z-health/neurology/alzheimers-disease-what-it-is-causes-symptoms-stages-treatments-prevention

  Some other risk factors for Alzheimers include the following. […] People 50 years of age and older who suffer a traumatic brain injury (TBI) are at an increased risk for dementia and Alzheimers. […] Some animal research has linked exposure to air pollutants such as traffic exhaust and burning wood to the risk of dementia, but more research is needed. […] Drinking excessive amounts of alcohol may cause brain changes. These brain changes may increase the risk for dementia, particularly early-onset dementia. […] Some of the risk factors associated with heart disease may also be the same for Alzheimers. […] Research has shown that people who dont stimulate their brains or engage with others are more likely to develop Alzheimers.

• #66 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Scientists know genes are involved in Alzheimers. Two categories of genes influence whether a person develops a disease: risk genes and deterministic genes. Alzheimer’s genes have been found in both categories. It is estimated that less than 1% of Alzheimers cases are caused by deterministic genes (genes that cause a disease, rather than increase the risk of developing a disease). […] There is a link between head injury and future risk of dementia. […] The risk of developing dementia appears to be increased by many conditions that also are not good for our hearts, including high blood pressure and diabetes. […] Research shows that older Latinos are about one-and-a-half times as likely as older whites to have Alzheimers and other dementias, while older African Americans are about twice as likely to have the disease as older whites. The reason for these differences is not well understood, but researchers believe that higher rates of vascular disease in these groups may also put them at greater risk for developing Alzheimers.

• #67 What Causes Alzheimer’s Disease? | Ochsner Health

  https://blog.ochsner.org/articles/what-causes-alzheimers-disease

  Some researchers estimate that older African American people are about twice as likely as older white people to have a diagnosis of Alzheimers disease, while older Latino people are about 1 1/2 times as likely compared to older white people. While the reasons for these differences are unclear, they are believed to involve many complex social, environmental and biological factors that interact with each other. Higher rates of vascular disease in these groups might play an important role. More research is needed to better understand how Alzheimers disease affects minority groups.

• #68 Comprehensive Review on Alzheimer’s Disease: Causes and Treatment

  https://www.mdpi.com/1420-3049/25/24/5789

  Alzheimer’s disease (AD) is considered a multifactorial disease: two main hypotheses were proposed as a cause for AD, cholinergic and amyloid hypotheses. […] The underlying cause of pathological changes in Alzheimer’s disease (Aβ, NFTs, and synaptic loss) is still unknown. Several hypotheses were proposed as a cause for AD but two of them are believed to be the main cause: some believe that an impairment in the cholinergic function is a critical risk factor for AD, while others suggest that alteration in amyloid β-protein production and processing is the main initiating factor. […] The most important risk factor in AD is aging. Younger individuals rarely have this disease, and most AD cases have a late onset that starts after 65 years of age. […] Genetic factors were discovered over the years and were found to play a major role in the development of AD. 70% of the AD cases were related to genetic factors: most cases of EOAD are inherited in an autosomal dominant pattern and mutations in the dominant genes such as Amyloid precursor protein (APP), Presenilin-1 (PSEN-1), Presenilin-2 (PSEN-2), and apolipoprotein E (ApoE) are associated with AD.

• #69 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  Alzheimers disease (AD) stands as the predominant form of dementia, presenting significant and escalating global challenges. Its etiology is intricate and diverse, stemming from a combination of factors such as aging, genetics, and environment. […] The etiology of AD is complex and diverse, and the precise mechanisms underlying its onset are not yet completely understood. Beyond the pivotal role of A and tau, a spectrum of other factors may contribute to the pathology of AD, such as acetylcholine deficiency, neuroinflammation, oxidative stress, biometal dyshomeostasis, glutamate imbalance, insulin resistance, gut microbiome abnormalities, cholesterol homeostasis disruption, mitochondrial dysfunction, and autophagy abnormalities. […] The hypotheses surrounding these pathogenic factors provide potential targets for drug development. However, the development of effective AD drugs has been fraught with challenges.

• #70 Alzheimer’s Disease: Epidemiology, Etiology, Risk Factors, and Future Predictions | SpringerLink

  https://link.springer.com/chapter/10.1007/978-981-96-0259-9_3

  Alzheimers disease (AD) remains a significant global health challenge, characterized by progressive cognitive decline and neurodegeneration. […] While FAD is linked to genetic mutations, SAD is multifactorial, involving genetic, environmental, and lifestyle factors. Various hypotheses, including the amyloid hypothesis, cholinergic deficit, impaired brain insulin signaling, oxidative stress, and neuroinflammation, contribute to our understanding of AD pathogenesis. […] Hardy J, Allsop D (1991) Amyloid deposition as the central event in the aetiology of Alzheimers disease. […] Hardy J, Higgins G (1992) Alzheimers disease: the amyloid cascade hypothesis. […] Hardy J, Selkoe DJ (2002) The amyloid hypothesis of Alzheimers disease: progress and problems on the road to therapeutics. […] Sheppard O, Coleman MP (2020) Alzheimers disease: etiology, neuropathology and pathogenesis.

• #71 Alzheimer’s Disease: Etiology, Neuropathology and Pathogenesis – Alzheimer’s Disease: Drug Discovery – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK566126/

  AD can be classified by when the disease manifests, and whether it is inherited. Early-onset Alzheimers disease (EOAD) occurs before age 65, whereas late-onset Alzheimers disease (LOAD) accounts for over 95% of cases and manifests beyond age 65. Familial AD shows Mendelian (usually dominant) inheritance, while sporadic AD shows no simple familial link. Nearly all EOAD are familial as these cases are due to mutations in APP, PSEN1 or PSEN2, and a vast majority of LOAD are sporadic. Genome wide association studies (GWAS) and sequencing have now provided more than 20 risk loci in total that contribute to sporadic cases, but often there is no identifiable genetic cause. […] A precursor protein (APP) was the first gene shown to have autosomal dominant mutations causing AD. As the precursor of the aggregated peptide in amyloid plaques, its discovery in 1991 by John Hardy and colleagues led to the amyloid hypothesis, which states that the toxic build-up of A starts a cascade of events, leading to neuronal death and disease.

• #72 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  The causes of Alzheimer’s disease remain poorly understood. […] The strongest genetic risk factor is from an allele of apolipoprotein E. […] The progression of the disease is largely characterised by the accumulation of malformed protein deposits in the cerebral cortex, called amyloid plaques and neurofibrillary tangles. […] The cause for most Alzheimer’s cases is still mostly unknown, except for 12% of cases where deterministic genetic differences have been identified. […] Several competing hypotheses attempt to explain the underlying cause; the most predominant hypothesis is the amyloid beta (A) hypothesis. […] The 1991 amyloid hypothesis postulated that extracellular amyloid beta (A) deposits are the fundamental cause of the disease. […] A specific isoform of apolipoprotein, APOE4, is a major genetic risk factor for Alzheimer’s disease.

• #73 Alzheimer’s Disease Causes, Symptoms, Stages, Life Expectancy

  https://www.medicinenet.com/alzheimers_disease_causes_stages_and_symptoms/article.htm

  Alzheimer’s disease (AD) is a slowly progressive disease of the brain that is characterized by impairment of memory and eventually by disturbances in reasoning, planning, language, and perception. Many scientists believe that Alzheimer’s disease results from an increase in the production or accumulation of a specific protein (beta-amyloid protein) in the brain that leads to nerve cell death. […] The cause(s) of Alzheimer’s disease is (are) not known. The „amyloid cascade hypothesis” is the most widely discussed and researched hypothesis about the cause of Alzheimer’s disease. The strongest data supporting the amyloid cascade hypothesis comes from the study of early-onset inherited (genetic) Alzheimer’s disease. Mutations associated with Alzheimer’s disease have been found in about half of the patients with early-onset disease. In all of these patients, the mutation leads to excess production in the brain of a specific form of a small protein fragment called ABeta (A). Many scientists believe that in the majority of sporadic (for example, non-inherited) cases of Alzheimer’s disease (these make up the vast majority of all cases of Alzheimer’s disease) there is too little removal of this A protein rather than too much production. In any case, much of the research in finding ways to prevent or slow down Alzheimer’s disease has focused on ways to decrease the amount of A in the brain. […] In the majority of Alzheimer’s disease cases, however, no specific genetic risks have yet been identified.

• #74 Alzheimer Disease: Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1134817-overview

  Mutations in the following genes unequivocally cause early-onset autosomal dominant AD: The amyloid precursor protein (APP) gene on chromosome 21, The presenilin-1 (PS1) gene on chromosome 14, The presenilin-2 (PS2) gene on chromosome 1. […] All 3 of these genes lead to a relative excess in the production of the stickier 42-amino acid form of the Ab peptide over the less sticky 40-amino-acid form. […] This beta-pleated peptide is postulated to have neurotoxic properties and to lead to a cascade of events (as yet incompletely understood) that results in neuronal death, synapse loss, and the formation of NFTs and SPs, among other lesions. […] Other than the apolipoprotein E epsilon 4 (APOE E4) genotype, no polymorphisms in other genes have been consistently found to be associated with late-onset AD.

• #75 What causes Alzheimer’s? Not toxic amyloid, new study suggests

  https://www.medicalnewstoday.com/articles/327412

  Many researchers have argued that the accumulation of toxic beta-amyloid in the brain causes Alzheimers. However, a new study offers some evidence contradicting this sequence. […] So far, the prevailing hypothesis among experts has been that the excessive accumulation of a potentially toxic protein beta-amyloid in the brain causes Alzheimers. […] Now, a new study from the University of California San Diego School of Medicine and the Veterans Affairs San Diego Healthcare System suggests that while the buildup of beta-amyloid has associations with Alzheimers, it may not actually cause the condition. […] The scientific community has long thought that amyloid drives the neurodegeneration and cognitive impairment associated with Alzheimers disease, says senior author Prof. Mark Bondi. […] This work suggests that cognitive changes may be occurring before significant levels of amyloid have accumulated. It seems like we may need to focus on treatment targets of pathologies other than amyloid, such as tau, that are more highly associated with the thinking and memory difficulties that impact peoples lives.

• #76 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  The cholinergic hypothesis was the earliest to delineate the pathogenesis of AD. It describes the severe damage of cholinergic neurons in the nucleus basalis of meynert (NBM), leading to a marked decrease in choline acetyltransferase (ChAT) activity within the primary projection areas – the cerebral cortex and hippocampus (regions associated with learning and memory). […] The accumulation of A is a hallmark pathological feature in both extensively studied autosomal dominant AD and sporadic late-onset AD patients. […] The amyloid cascade has been proposed for over 30 years, which provided crucial insights into the mechanisms of AD’s onset and progression. […] The amyloid cascade hypothesis remains controversial. This theory faces challenges in explaining the diverse pathological features, shows a weak correlation between A and cognitive decline, and has failed to demonstrate efficacy in numerous clinical drugs to target A.

• #77 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  The cholinergic hypothesis was the earliest to delineate the pathogenesis of AD. It describes the severe damage of cholinergic neurons in the nucleus basalis of meynert (NBM), leading to a marked decrease in choline acetyltransferase (ChAT) activity within the primary projection areas – the cerebral cortex and hippocampus (regions associated with learning and memory). […] The accumulation of A is a hallmark pathological feature in both extensively studied autosomal dominant AD and sporadic late-onset AD patients. […] The amyloid cascade has been proposed for over 30 years, which provided crucial insights into the mechanisms of AD’s onset and progression. […] The amyloid cascade hypothesis remains controversial. This theory faces challenges in explaining the diverse pathological features, shows a weak correlation between A and cognitive decline, and has failed to demonstrate efficacy in numerous clinical drugs to target A.

• #78 Causes and Risk Factors of Alzheimer’s Disease

  https://www.health.com/alzheimers-disease-causes-7092835

  The causes of Alzheimer’s disease are unknown, but the condition does have theorized causes like acetylcholine deficiency and risk factors related to its development. […] Researchers believe genetics combined with lifestyle and environmental factors leads to the development of this condition. […] Another theorized cause of Alzheimer’s disease is a deficiency in the brain messenger chemical called acetylcholine (ACh). ACh plays a role in brain functions like learning and memory. […] For many years, researchers believed that abnormally high levels of beta-amyloida protein that surrounds nerve cells formed amyloid plaques in the brain. These plaques are thought to contribute to the cognitive loss associated with Alzheimer’s disease. […] Some cases of early-onset Alzheimer’s disease are familial, meaning children may inherit certain mutations from their parents. In those cases, gene mutations cause the disease.

• #79 Causes and Risk Factors of Alzheimer’s Disease

  https://www.health.com/alzheimers-disease-causes-7092835

  The causes of Alzheimer’s disease are unknown, but the condition does have theorized causes like acetylcholine deficiency and risk factors related to its development. […] Researchers believe genetics combined with lifestyle and environmental factors leads to the development of this condition. […] Another theorized cause of Alzheimer’s disease is a deficiency in the brain messenger chemical called acetylcholine (ACh). ACh plays a role in brain functions like learning and memory. […] For many years, researchers believed that abnormally high levels of beta-amyloida protein that surrounds nerve cells formed amyloid plaques in the brain. These plaques are thought to contribute to the cognitive loss associated with Alzheimer’s disease. […] Some cases of early-onset Alzheimer’s disease are familial, meaning children may inherit certain mutations from their parents. In those cases, gene mutations cause the disease.

• #80 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  The cholinergic hypothesis was the earliest to delineate the pathogenesis of AD. It describes the severe damage of cholinergic neurons in the nucleus basalis of meynert (NBM), leading to a marked decrease in choline acetyltransferase (ChAT) activity within the primary projection areas – the cerebral cortex and hippocampus (regions associated with learning and memory). […] The accumulation of A is a hallmark pathological feature in both extensively studied autosomal dominant AD and sporadic late-onset AD patients. […] The amyloid cascade has been proposed for over 30 years, which provided crucial insights into the mechanisms of AD’s onset and progression. […] The amyloid cascade hypothesis remains controversial. This theory faces challenges in explaining the diverse pathological features, shows a weak correlation between A and cognitive decline, and has failed to demonstrate efficacy in numerous clinical drugs to target A.

• #81 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  Late-onset Alzheimer’s is about 70% heritable. […] The strongest genetic risk factor for sporadic Alzheimer’s disease is APOE4. […] Only 12% of Alzheimer’s cases are inherited due to autosomal dominant effects, as Alzheimer’s is highly polygenic. […] Early onset familial Alzheimer’s disease can be attributed to mutations in one of three genes: those encoding amyloid-beta precursor protein (APP) and presenilins PSEN1 and PSEN2. […] Alleles in the TREM2 gene have been associated with a three to five times higher risk of developing Alzheimer’s disease. […] The tau hypothesis proposes that tau protein abnormalities initiate the disease cascade. […] A number of studies connect the misfolded amyloid beta and tau proteins associated with the pathology of Alzheimer’s disease, as bringing about oxidative stress that leads to neuroinflammation.

• #82 Alzheimer’s Disease | Stanford Health Care

  https://stanfordhealthcare.org/medical-conditions/brain-and-nerves/dementia/types/alzheimers-disease.html

  Neurofibrillary tangles are bundles of twisted filaments found within neurons. These tangles are largely made up of a protein called tau. In healthy neurons, the tau protein helps the functioning of microtubules, which are part of the cell’s structural support and deliver substances throughout the nerve cell. However, in Alzheimer’s disease, tau is changed in a way that causes it to twist into pairs of helical filaments that collect into tangles. When this happens, the microtubules cannot function correctly and they disintegrate. This collapse of the neuron’s transport system may impair communication between nerve cells and cause them to die. […] Researchers do not know if amyloid plaques and neurofibrillary tangles are harmful or if they are merely side effects of the disease process that damages neurons and leads to the symptoms of Alzheimer’s disease. They do know that plaques and tangles usually increase in the brain as Alzheimer’s disease progresses.

• #83 Alzheimer’s Disease | Stanford Health Care

  https://stanfordhealthcare.org/medical-conditions/brain-and-nerves/dementia/types/alzheimers-disease.html

  Neurofibrillary tangles are bundles of twisted filaments found within neurons. These tangles are largely made up of a protein called tau. In healthy neurons, the tau protein helps the functioning of microtubules, which are part of the cell’s structural support and deliver substances throughout the nerve cell. However, in Alzheimer’s disease, tau is changed in a way that causes it to twist into pairs of helical filaments that collect into tangles. When this happens, the microtubules cannot function correctly and they disintegrate. This collapse of the neuron’s transport system may impair communication between nerve cells and cause them to die. […] Researchers do not know if amyloid plaques and neurofibrillary tangles are harmful or if they are merely side effects of the disease process that damages neurons and leads to the symptoms of Alzheimer’s disease. They do know that plaques and tangles usually increase in the brain as Alzheimer’s disease progresses.

• #84 Alzheimer’s disease: risk factors and potentially protective measures | Journal of Biomedical Science | Full Text

  https://jbiomedsci.biomedcentral.com/articles/10.1186/s12929-019-0524-y

  A number of acquired factors increase the risk of developing AD. Among those factors are cerebrovascular diseases (most commonly reported risk factor), diabetes, hypertension, obesity and dyslipidemia. […] The exact mechanism by which deposition of A peptide promotes NFT formation of hyperphosphorylated tau protein is not known. […] The A peptide promotes the activation of specific kinases (GSK3, e.g.) that catalyze the hyperphosphorylation of tau protein, leading to its conformation change and formation of NFT. […] Studies demonstrate that cerebral ischemia is capable of leading to the accumulation of APP and A, in addition to stimulating the expression of presenilin, involved in A synthesis.

• #85 Alzheimer’s disease – Wikipedia

  https://en.wikipedia.org/wiki/Alzheimer%27s_disease

  Late-onset Alzheimer’s is about 70% heritable. […] The strongest genetic risk factor for sporadic Alzheimer’s disease is APOE4. […] Only 12% of Alzheimer’s cases are inherited due to autosomal dominant effects, as Alzheimer’s is highly polygenic. […] Early onset familial Alzheimer’s disease can be attributed to mutations in one of three genes: those encoding amyloid-beta precursor protein (APP) and presenilins PSEN1 and PSEN2. […] Alleles in the TREM2 gene have been associated with a three to five times higher risk of developing Alzheimer’s disease. […] The tau hypothesis proposes that tau protein abnormalities initiate the disease cascade. […] A number of studies connect the misfolded amyloid beta and tau proteins associated with the pathology of Alzheimer’s disease, as bringing about oxidative stress that leads to neuroinflammation.

• #86 Are some cases of Alzheimer’s disease caused by infection? – Harvard Health

  https://www.health.harvard.edu/mind-and-mood/are-some-cases-of-alzheimers-disease-caused-by-infection

  Amyloid-beta probably is the most important molecule. It shows up earlier than tau. And Tanzi and others have shown that people who inherit a gene that leads them to have high levels of amyloid-beta develop Alzheimer’s at a relatively young age. People who inherit two copies of the APOE4 gene variant are at even greater risk of developing Alzheimer’s, because they are less able to clear amyloid-beta out of the brain. […] Inflammation in the brain (neuroinflammation) is increasingly accepted as an important factor in Alzheimer’s. In neuroinflammation, the brain’s own immune system cells fight invading microbes or work to heal injury. Unfortunately, that also can cause injury, leading to more neuroinflammation a vicious cycle that ultimately causes most of the death of neurons. […] Both amyloid-beta plaques and tau tangles can trigger neuroinflammation, and so can many microbes (bacteria and viruses). Some microbes can infect the brain and remain there without being completely eradicated by the brain’s immune system, potentially leading to chronic, low-grade neuroinflammation. Even infections or other causes of inflammation outside of the brain, anywhere in the body, can send signals to the brain that trigger neuroinflammation.

• #87 Causes of Alzheimer’s Disease and Related Dementias – NCCDP

  https://www.nccdp.org/causes-of-alzheimers-disease-and-related-dementias/

  However, in Alzheimers, tau proteins twist into abnormal tangles, leading to the failure of the transport system and, subsequently, the death of nerve cells. […] Beyond these tangible protein abnormalities, chronic inflammation emerges as a significant factor. […] Persistent inflammation, especially around beta-amyloid plaques, exacerbates brain cell damage, accelerating the progression of Alzheimers. […] Lastly, one cannot discuss Alzheimers without acknowledging the influence of genetics. Certain genes, when inherited, increase the likelihood of developing Alzheimers. […] While not deterministic, these genetic factors elevate susceptibility, especially when combined with environmental and lifestyle factors. […] In understanding these biological mechanisms, we gain invaluable insights into the inner workings of a brain with Alzheimers.

• #88 Causes of Alzheimer’s Disease and Related Dementias – NCCDP

  https://www.nccdp.org/causes-of-alzheimers-disease-and-related-dementias/

  However, in Alzheimers, tau proteins twist into abnormal tangles, leading to the failure of the transport system and, subsequently, the death of nerve cells. […] Beyond these tangible protein abnormalities, chronic inflammation emerges as a significant factor. […] Persistent inflammation, especially around beta-amyloid plaques, exacerbates brain cell damage, accelerating the progression of Alzheimers. […] Lastly, one cannot discuss Alzheimers without acknowledging the influence of genetics. Certain genes, when inherited, increase the likelihood of developing Alzheimers. […] While not deterministic, these genetic factors elevate susceptibility, especially when combined with environmental and lifestyle factors. […] In understanding these biological mechanisms, we gain invaluable insights into the inner workings of a brain with Alzheimers.

• #89 Probable Causes of Alzheimer’s Disease

  https://www.mdpi.com/2413-4155/3/1/16

  A three-part mechanism is proposed for the induction of Alzheimer’s disease: (1) decreased blood lactic acid; (2) increased blood ceramide and adipokines; (3) decreased blood folic acid. […] Alzheimer’s disease is caused by a cascade of events that culminates in damage to the blood–brain barrier and damage to neurons. […] Decreased blood lactic acid is involved in causing Alzheimer’s disease. […] High levels of ceramide in the blood and brain are involved in causing Alzheimer’s disease. […] Many people use marijuana, Cannabis sativa, to self-treat their dementia and Alzheimer’s disease. […] Several inflammatory adipokines are elevated in the blood of patients with Alzheimer’s disease, including dipeptidyl peptidase-4, IL-1β, IL-2, IL-6, IL-18, interferon-γ, C-reactive protein, CXC chemokine-10, epidermal growth factor, vascular cell adhesion protein1, tumor necrosis factor α and leptin. […] High blood IL-1β levels are involved in causing Alzheimer’s disease. […] Inadequate dietary folate is involved in causing Alzheimer’s disease. […] Alzheimer’s disease is caused by this cascade of events. Many of these events can be prevented, which makes Alzheimer’s disease preventable.

• #90 Alzheimer’s Research on Causes and Risk Factors – Fisher Center for Alzheimer’s Research Foundation

  https://www.alzinfo.org/articles/what-causes-alzheimers/

  We still dont fully understand what causes Alzheimers disease, but scientists are zeroing in on the answers. […] Scientists generally agree that a single clear cause of Alzheimers is unlikely. The disease is more likely the result of a combination of inter-related factors, including genetics, environmental influences, and even lifestyle. […] Each of these risk factors is currently the subject of a great deal of research including a growing body of research to identify various lifestyle factors, such as dietary habits, high blood pressure and high cholesterol, which may influence ones risk of Alzheimers disease. […] What is clear is that Alzheimers develops as a result of a complex cascade of biological processes in the brain that take place over many. […] The use of certain groups of drugs including non-steroidal anti-inflammatory drugs (NSAIDs) and cholesterol-lowering drugs called statins may also impact Alzheimers risk, according to a number of studies. Compelling new evidence is now indicating that other lifestyle factors, such as ones dietary habits, high blood pressure and high cholesterol, may impact ones risk for developing Alzheimers disease.

• #91 What Causes Alzheimer’s Disease: Know the Risk Factors • MindCrowd

  https://mindcrowd.org/what-causes-alzheimers-disease-risk-factors/

  It is unlikely that late onset Alzheimers is all due to genetics. And its also as unlikely that its 100% due to environment factors. […] Many people get Alzheimers disease in the absence of any family history. So, it isn’t surprising to get Alzheimers disease with no history of it in your family. […] If you get your DNA tested, what we can tell you today is your risk. The test cannot predict the future. […] There are always people who are at a very high genetic risk for Alzheimers disease and they live a very long life to their 80s or 90s and do not get the disease. […] Because of that, it is hard to advocate for getting a genetic test for Alzheimers disease. […] We hope this article will help you make more informed decisions about your lifestyle choices and reduce your risk of Alzheimers disease.

• #92 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #93 What Causes Alzheimer’s Disease: Know the Risk Factors • MindCrowd

  https://mindcrowd.org/what-causes-alzheimers-disease-risk-factors/

  It is unlikely that late onset Alzheimers is all due to genetics. And its also as unlikely that its 100% due to environment factors. […] Many people get Alzheimers disease in the absence of any family history. So, it isn’t surprising to get Alzheimers disease with no history of it in your family. […] If you get your DNA tested, what we can tell you today is your risk. The test cannot predict the future. […] There are always people who are at a very high genetic risk for Alzheimers disease and they live a very long life to their 80s or 90s and do not get the disease. […] Because of that, it is hard to advocate for getting a genetic test for Alzheimers disease. […] We hope this article will help you make more informed decisions about your lifestyle choices and reduce your risk of Alzheimers disease.

• #94 Causes – Alzheimer’s Los Angeles

  https://www.alzheimersla.org/for-families/understanding-memory-loss/causes/

  Peoples genes, which are inherited from their biological parents, can affect how likely they are to develop Alzheimer’s disease. Genetic risk factors are changes or differences in genes that can influence the chance of getting a disease. These risk factors are the reason some diseases run in families. […] Research suggests that a host of factors beyond genetics may play a role in the development and course of Alzheimer’s disease. There is a great deal of interest, for example, in the relationship between cognitive decline and vascular conditions such as heart disease, stroke, and high blood pressure, as well as metabolic conditions such as diabetes and obesity. Ongoing research will help us understand whether and how reducing risk factors for these conditions may also reduce the risk of Alzheimer’s. […] A nutritious diet, physical activity, social engagement, sleep, and mentally stimulating pursuits have all been associated with helping people stay healthy as they age. These factors might also help reduce the risk of cognitive decline and Alzheimer’s disease.

• #95 Alzheimer’s Research on Causes and Risk Factors – Fisher Center for Alzheimer’s Research Foundation

  https://www.alzinfo.org/articles/what-causes-alzheimers/

  We still dont fully understand what causes Alzheimers disease, but scientists are zeroing in on the answers. […] Scientists generally agree that a single clear cause of Alzheimers is unlikely. The disease is more likely the result of a combination of inter-related factors, including genetics, environmental influences, and even lifestyle. […] Each of these risk factors is currently the subject of a great deal of research including a growing body of research to identify various lifestyle factors, such as dietary habits, high blood pressure and high cholesterol, which may influence ones risk of Alzheimers disease. […] What is clear is that Alzheimers develops as a result of a complex cascade of biological processes in the brain that take place over many. […] The use of certain groups of drugs including non-steroidal anti-inflammatory drugs (NSAIDs) and cholesterol-lowering drugs called statins may also impact Alzheimers risk, according to a number of studies. Compelling new evidence is now indicating that other lifestyle factors, such as ones dietary habits, high blood pressure and high cholesterol, may impact ones risk for developing Alzheimers disease.

• #96 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #97 WHAT CAUSES ALZHEIMER’S? – Alzheimer’s Research Association

  https://www.alzra.org/alzheimers/alzheimers-causes/

  Scientists do not yet fully understand what causes Alzheimers Disease, but it is clear that it develops because of a complex series of events that take place in the brain over a long period of time. […] Despite being the sixth definitive leading cause of death in the United States, the definite cause of Alzheimers disease is still unknown. […] Although aging does not cause Alzheimers disease, it is a significant risk factor. […] Genetics can play a role in some people with Alzheimers. […] The majority of cases are late-onset Alzheimers, which develops after age 60. […] Four to seven other Alzheimers risk-factor genes may exist as well. […] Research suggests that certain lifestyle factors, such as a nutritious diet, exercise, social engagement, and mentally stimulating pursuits, might help to reduce the risk of cognitive decline and Alzheimers disease. […] Conditions that affect both the heart and vascular health are likely to increase Alzheimers risk in an individual. […] Research suggests an association between head injury and increased risk of dementia.

• #98 WHAT CAUSES ALZHEIMER’S? – Alzheimer’s Research Association

  https://www.alzra.org/alzheimers/alzheimers-causes/

  Scientists do not yet fully understand what causes Alzheimers Disease, but it is clear that it develops because of a complex series of events that take place in the brain over a long period of time. […] Despite being the sixth definitive leading cause of death in the United States, the definite cause of Alzheimers disease is still unknown. […] Although aging does not cause Alzheimers disease, it is a significant risk factor. […] Genetics can play a role in some people with Alzheimers. […] The majority of cases are late-onset Alzheimers, which develops after age 60. […] Four to seven other Alzheimers risk-factor genes may exist as well. […] Research suggests that certain lifestyle factors, such as a nutritious diet, exercise, social engagement, and mentally stimulating pursuits, might help to reduce the risk of cognitive decline and Alzheimers disease. […] Conditions that affect both the heart and vascular health are likely to increase Alzheimers risk in an individual. […] Research suggests an association between head injury and increased risk of dementia.

• #99 What Causes Alzheimer’s Disease? | Alzheimer’s Association

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers/causes-and-risk-factors

  Researchers believe that many risk factors play a role in causing Alzheimer’s and other dementias, including genetics, behaviors and habits. While some risk factors, such as age and family history, may be set in their influence, there are many risk factors that can be changed to potentially reduce a person’s risk of cognitive decline. […] The greatest known risk factor for Alzheimers and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer’s. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer’s doubles every five years. After age 85, the risk reaches nearly one-third. […] Another strong risk factor for Alzheimer’s is family history. According to research, those who have a parent, brother or sister with Alzheimers are more likely to develop the disease. The risk increases if more than one family member has the illness. Modifiable risk factors such as sleep, smoking habits, hypertension or diabetes can further increase the risk.

• #100 Alzheimer’s Disease: Causes and Risk Factors | Psych Central

  https://psychcentral.com/lib/causes-of-alzheimers-disease

  Theres still a lot to learn about what causes Alzheimers disease, but there are some changes you can make to reduce your risk factors. […] There is still much to learn about what causes Alzheimers disease and the most effective types of treatment. Alzheimers disease research is active and ongoing, with many researchers conducting studies and clinical trials exploring possible prevention and effective treatment options. […] While its generally understood that the impairment and loss of neurons cause the symptoms of Alzheimers disease, researchers are still looking into what causes these changes and why some people develop Alzheimers and others do not. […] While the causes of early onset Alzheimers are unknown, researchers have found that genetics can play a role in some rare cases. […] There is no exact known cause for Alzheimers. And due to the lack of verifiable evidence, researchers dont believe aluminum, bacteria, or diet coke can cause Alzheimers.

• #101 Everything you need to know about the causes of Alzheimer’s disease – Alzheimer’s Research UK

  https://www.alzheimersresearchuk.org/news/everything-you-need-to-know-about-the-causes-of-alzheimers-disease/

  Amyloid is a key hallmark of Alzheimer’s disease. […] This amyloid build-up has a range of unhelpful knock-on effects for brain cells. […] Amyloid can also disrupt blood flow in the brain, by building-up in blood vessel walls and affecting the ability of blood vessels to respond to changes in demand. […] In Alzheimer’s, tau also starts to behave out of character. […] Researchers are working tirelessly to understand the causes of Alzheimer’s disease. […] Huge leaps in our knowledge have already been made by the research community, identifying key players, unravelling the sequence of events and understanding which processes are the most toxic. […] Scientists are working together across the globe to drive progress in this area, adding new pieces of knowledge to our growing understanding of Alzheimer’s.

• #102 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  The connection between comorbidities and the pathological changes in AD is currently the subject of ongoing research. […] The development of AD drugs has faced numerous challenges. Factors contributing to the suboptimal performance of drugs include the selection of drug targets, the use of biomarkers and animal models in experimental designs, and other issues such as late treatment initiation, dose-dependent side effects, challenges in BBB permeability, and the heterogeneous presentation of patients. […] The multifactorial nature of AD onset, coupled with the complex interactions among these factors, poses significant challenges to drug development.

• #103 What Causes Alzheimer’s? We Don’t Really Know Yet | Live Science

  https://www.livescience.com/64597-causes-alzheimers-disease.html

  Scientists don’t really know yet. Alzheimer’s is likely not simply the result of one cause, but rather a combination of genetic, environmental and lifestyle factors, Patira told Live Science. […] For example, a mutation in a gene called ApoE is thought to increase a person’s risk for developing late-onset Alzheimer’s, but it does not cause it, Patira said. […] Potential environmental causes include radiation, concussions, trauma and exposure to certain chemicals, Patira said. […] The study that spurred last week’s headlines was published on Jan. 23 in the journal Science Advances. In this study, researchers suggested that Porphyromonas gingivalis, the bacteria that cause a common type of gum disease, may also play a role in Alzheimer’s. […] The idea that bacterial or viral infections could play a role in the development of Alzheimer’s was „a bit out of the mainstream” up until maybe a year ago, Fargo told Live Science.

• #104 What is Dementia? Symptoms, Causes & Treatment | alz.org

  https://www.alz.org/alzheimers-dementia/what-is-dementia

  Treatment of dementia depends on its cause. In the case of most progressive dementias, including Alzheimer’s disease, there is no cure, but two treatments donanemab (Kisunla) and lecanemab (Leqembi) demonstrate that removing beta-amyloid, one of the hallmarks of Alzheimers disease, from the brain reduces cognitive and functional decline in people living with early Alzheimers.

• #105 What is Alzheimer’s Disease? Symptoms & Causes | alz.org

  https://www.alz.org/alzheimers-dementia/what-is-alzheimers

  Alzheimer’s is the most common cause of dementia, a general term for memory loss and other cognitive abilities serious enough to interfere with daily life. Alzheimer’s disease accounts for 60-80% of dementia cases. […] Alzheimer’s is not a normal part of aging. The greatest known risk factor is increasing age, and the majority of people with Alzheimer’s are 65 and older. Alzheimer’s disease is considered to be younger-onset Alzheimer’s if it affects a person under 65. Younger-onset can also be referred to as early-onset Alzheimer’s. […] Alzheimer’s has no cure, but two treatments donanemab (Kisunla) and lecanemab (Leqembi) demonstrate that removing beta-amyloid, one of the hallmarks of Alzheimer’s disease, from the brain reduces cognitive and functional decline in people living with early Alzheimer’s. […] Scientists believe Alzheimer’s disease prevents parts of a cell’s factory from running well. […] Most experts believe they somehow play a critical role in blocking communication among nerve cells and disrupting processes that cells need to survive.

• #106 Recent advances in Alzheimer’s disease: mechanisms, clinical trials and new drug development strategies | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01911-3

  The connection between comorbidities and the pathological changes in AD is currently the subject of ongoing research. […] The development of AD drugs has faced numerous challenges. Factors contributing to the suboptimal performance of drugs include the selection of drug targets, the use of biomarkers and animal models in experimental designs, and other issues such as late treatment initiation, dose-dependent side effects, challenges in BBB permeability, and the heterogeneous presentation of patients. […] The multifactorial nature of AD onset, coupled with the complex interactions among these factors, poses significant challenges to drug development.

• #107 What Causes Alzheimer’s? We Don’t Really Know Yet | Live Science

  https://www.livescience.com/64597-causes-alzheimers-disease.html

  „There may be some kind of infectious agent that attacks the brain and, as part of the immune system’s response to that infectious agent, amyloid plaques may develop,” Fargo said. […] The microbes most commonly suspected of playing a role in Alzheimer’s are herpesviruses. […] But even if a virus plays a role in the development of the disease, it’s likely not the only factor. […] Whether infectious agents play a role or even cause Alzheimer’s, Fargo wanted to make one thing clear: „There is no reason for anyone to believe that Alzheimer’s disease is contagious.” […] Most scientists in this field are expecting that they will soon learn that there are multiple causes of Alzheimer’s, Fargo said.

• #108 What Causes Alzheimer’s Disease? | National Institute on Aging

  https://www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-causes-alzheimers-disease

  Research suggests that a host of factors beyond age and genetics may play a role in the development and course of Alzheimers. […] Scientists are also looking at the role of metabolic diseases, such as diabetes and obesity. […] In addition, other medical conditions associated with a higher risk of Alzheimers include: Hearing loss, Depression, Mild cognitive impairment, Concussion or other traumatic brain injury. […] However, there may be ways to promote better brain health and reduce your risk of Alzheimers by addressing certain lifestyle factors. […] Researchers cannot yet say for certain whether making positive changes in these areas can prevent dementia, but doing so is beneficial to living a healthier lifestyle overall.

• #109 Causes – Alzheimer’s Los Angeles

  https://www.alzheimersla.org/for-families/understanding-memory-loss/causes/

  Peoples genes, which are inherited from their biological parents, can affect how likely they are to develop Alzheimer’s disease. Genetic risk factors are changes or differences in genes that can influence the chance of getting a disease. These risk factors are the reason some diseases run in families. […] Research suggests that a host of factors beyond genetics may play a role in the development and course of Alzheimer’s disease. There is a great deal of interest, for example, in the relationship between cognitive decline and vascular conditions such as heart disease, stroke, and high blood pressure, as well as metabolic conditions such as diabetes and obesity. Ongoing research will help us understand whether and how reducing risk factors for these conditions may also reduce the risk of Alzheimer’s. […] A nutritious diet, physical activity, social engagement, sleep, and mentally stimulating pursuits have all been associated with helping people stay healthy as they age. These factors might also help reduce the risk of cognitive decline and Alzheimer’s disease.

• #110 Top Causes and Risk Factors of Alzheimer’s Disease

  https://www.everydayhealth.com/alzheimers-disease/causes-risk-factors/

  Over the past three decades, scientists have identified a link between moderate and severe traumatic brain injury and an increased risk of Alzheimers disease or another dementia developing years later. […] Some studies have found an association between severe traumatic head injuries and elevated levels of the protein beta-amyloid in the brain, a characteristic of Alzheimers disease. […] Researchers have found encouraging evidence that healthy habits can protect the brain and reduce the risk of Alzheimers disease.

• #111 WHAT CAUSES ALZHEIMER’S? – Alzheimer’s Research Association

  https://www.alzra.org/alzheimers/alzheimers-causes/

  Scientists do not yet fully understand what causes Alzheimers Disease, but it is clear that it develops because of a complex series of events that take place in the brain over a long period of time. […] Despite being the sixth definitive leading cause of death in the United States, the definite cause of Alzheimers disease is still unknown. […] Although aging does not cause Alzheimers disease, it is a significant risk factor. […] Genetics can play a role in some people with Alzheimers. […] The majority of cases are late-onset Alzheimers, which develops after age 60. […] Four to seven other Alzheimers risk-factor genes may exist as well. […] Research suggests that certain lifestyle factors, such as a nutritious diet, exercise, social engagement, and mentally stimulating pursuits, might help to reduce the risk of cognitive decline and Alzheimers disease. […] Conditions that affect both the heart and vascular health are likely to increase Alzheimers risk in an individual. […] Research suggests an association between head injury and increased risk of dementia.

• #112 Causes – Alzheimer’s Los Angeles

  https://www.alzheimersla.org/for-families/understanding-memory-loss/causes/

  Peoples genes, which are inherited from their biological parents, can affect how likely they are to develop Alzheimer’s disease. Genetic risk factors are changes or differences in genes that can influence the chance of getting a disease. These risk factors are the reason some diseases run in families. […] Research suggests that a host of factors beyond genetics may play a role in the development and course of Alzheimer’s disease. There is a great deal of interest, for example, in the relationship between cognitive decline and vascular conditions such as heart disease, stroke, and high blood pressure, as well as metabolic conditions such as diabetes and obesity. Ongoing research will help us understand whether and how reducing risk factors for these conditions may also reduce the risk of Alzheimer’s. […] A nutritious diet, physical activity, social engagement, sleep, and mentally stimulating pursuits have all been associated with helping people stay healthy as they age. These factors might also help reduce the risk of cognitive decline and Alzheimer’s disease.

• #113 About Alzheimer’s | Alzheimer’s Disease and Dementia | CDC

  https://www.cdc.gov/alzheimers-dementia/about/alzheimers.html

  Alzheimer’s disease is the most common type of dementia. […] Alzheimer’s disease is a brain disorder caused by damage to nerve cells in the brain. […] We do not yet fully understand what causes Alzheimer’s disease. There likely is not one single factor, but rather a combination of factors that cause the disease. These factors, which may affect each person differently, include: Genes. Family history. Environmental factors. Lifestyle behaviors. […] Treatment of Alzheimer’s depends on the underlying cause and the progression of the disease.

• #114 What Is Alzheimer’s Disease?

  https://www.alzheimers.gov/alzheimers-dementias/alzheimers-disease

  Alzheimers disease is a brain disorder that slowly destroys memory and thinking skills and, eventually, the ability to carry out the simplest tasks. […] The causes of Alzheimers disease are not yet fully understood, but probably include a combination of: […] Age-related changes in the brain, like shrinking, inflammation, blood vessel damage, and breakdown of energy within cells, which may harm neurons and affect other brain cells. […] Changes or differences in genes, which may be passed down by a family member. […] Health, environmental, and lifestyle factors that may play a role, such as exposure to pollutants, heart disease, stroke, high blood pressure, diabetes, and obesity. […] Alzheimers disease is not a normal part of aging. Its the result of complex changes in the brain that start years before symptoms appear and lead to the loss of brain cells and their connections.

• #115 Alzheimer’s disease – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/symptoms-causes/syc-20350447

  Alzheimer’s disease is the biological process that begins with the appearance of a buildup of proteins in the form of amyloid plaques and neurofibrillary tangles in the brain. […] The exact causes of Alzheimer’s disease aren’t fully understood. But at a basic level, brain proteins don’t function as usual. This disrupts the work of brain cells, also known as neurons, and triggers a series of events. The neurons become damaged and lose connections to each other. They eventually die. […] Scientists believe that for most people, Alzheimer’s disease is caused by a combination of genetic, lifestyle and environmental factors that affect the brain over time. […] The disease begins years before the first symptoms. The damage most often starts in the region of the brain that manages memory. The loss of neurons spreads in a somewhat predictable pattern to other regions of the brain. By the late stage of the disease, the brain has shrunk. […] Researchers trying to understand the cause of Alzheimer’s disease are focused on the role of two proteins: […] In the brain of someone with Alzheimer’s disease, amyloid plaques form and tau proteins change shape and become tangles.

• #116 Alzheimer’s disease: Symptoms, stages, causes, and treatments

  https://www.medicalnewstoday.com/articles/159442

  Alzheimers disease is a neurological condition that causes a decline in thinking skills and memory. […] Alzheimers disease is the most common type of dementia. […] This article provides an overview of Alzheimers disease, including its symptoms, causes, and possible treatment options. […] One of the underlying biological changes of the condition is the presence of plaques and tangles in the brain. Another feature is a loss of connection between the nerve cells, or neurons, in the brain. […] Like all types of dementia, Alzheimers develops due to the death of brain cells. […] In a person with Alzheimers, the brain tissue has fewer and fewer nerve cells and connections. Tiny deposits, known as plaques and tangles, build up on the nerve tissue. […] Plaques develop between the dying brain cells. They consist of a protein known as beta-amyloid. Meanwhile, the tangles occur within the nerve cells. They consist of another protein known as tau. […] Researchers do not fully understand why these changes occur.

• #117 The causes and consequences of Alzheimer’s disease: phenome-wide evidence from Mendelian randomization | Nature Communications

  https://www.nature.com/articles/s41467-022-32183-6

  The effects of a higher genetic liability for Alzheimers disease are stronger in participants of aged 62-72 years, although the direction of effect is similar across age groups. […] We found evidence that a minority of the variables identified in the PheWAS are likely to causally affect the liability to Alzheimers disease. […] The PheWAS suggested that increased genetic liability for Alzheimers disease affected a diverse array of phenotypes such as medical history, brain-related phenotypes and physical, lifestyle and blood-based measures. […] Our sensitivity analysis, excluding the APOE region, replicated only the effects for family history of Alzheimers disease and some cognitive measures. […] Hence, the association observed in the PheWAS between the PRS, lower body fat measures, and diastolic blood pressure is likely to reflect the prodromal disease process.

• #118 Alzheimer’s Disease: What Causes It?

  https://www.mentalhealth.com/library/causes-of-alzheimers-disease-continued

  Research into what causes Alzheimer’s indicates that Alzheimer’s disease is associated with atherosclerosis, which is a primary cause of cardiovascular disease. […] There are various risk factors that can explain the causes of Alzheimer’s. […] The prevention of Alzheimer’s disease is being investigated by researchers worldwide. Although there are no proven ways so far to prevent the disease, studies have indicated that you can lower your chance of getting the disease.

• #119 Top Causes and Risk Factors of Alzheimer’s Disease

  https://www.everydayhealth.com/alzheimers-disease/causes-risk-factors/

  Over the past three decades, scientists have identified a link between moderate and severe traumatic brain injury and an increased risk of Alzheimers disease or another dementia developing years later. […] Some studies have found an association between severe traumatic head injuries and elevated levels of the protein beta-amyloid in the brain, a characteristic of Alzheimers disease. […] Researchers have found encouraging evidence that healthy habits can protect the brain and reduce the risk of Alzheimers disease.

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