Alzheimer’s Disease Causes
Science has not come up with conclusive evidence about the causes of Alzheimer's disease yet. However, scientists believe that Alzheimer's disease is mostly caused by a combination of bodily malfunctions, deficiencies, genetics, lifestyle, and environmental factors that affect the brain over time.
Below is a list of the possible causes of Alzheimer’s disease:
- Beta-amyloid accumulation: circulation of high levels of cholesterol in the blood leads to an increase in the formation of beta-amyloid plaques. They form ...
Alzheimer’s Disease Causes
Science has not come up with conclusive evidence about the causes of Alzheimer's disease yet. However, scientists believe that Alzheimer's disease is mostly caused by a combination of bodily malfunctions, deficiencies, genetics, lifestyle, and environmental factors that affect the brain over time.
Below is a list of the possible causes of Alzheimer’s disease:
- Beta-amyloid accumulation: circulation of high levels of cholesterol in the blood leads to an increase in the formation of beta-amyloid plaques. They form when proteins clump together and result in a hard, insoluble plaque. This plaque accumulates between the brain’s neurons, disrupting cell communication and function. This eventually results in the death of these cells. When brain cells degenerate and die, they can no longer process, store, and retrieve information. This leads to one of Alzheimer’s symptoms: impaired memory.
- Neurofibrillary tangles: an increase in enzymes called tau kinases disrupt the function of tau proteins. Their structure changes and they clump up, forming neurofibrillary tangles. The tangles disrupt the brain cell communication and damage cells.
- Blood flow deficiency: the brain must receive adequate blood flow to transport all the necessary nutrients to the cells. However, in Alzheimer’s disease, blood clots damage blood vessels. As a result, the parts of the brain that are responsible for memory such as the amygdala and the hippocampus don’t receive enough blood. This results in loss of brain function.
- Inflammation: inflammatory markers, such as cytokines, play a vital role in fighting off infection or injury when the body is in danger. However, as the levels of inflammatory markers increase in the body, cytokines start attacking parts of the brain and damaging healthy neurons.
- High cortisol levels: increased levels of cortisol are associated with stress. Higher cortisol levels also cause Alzheimer’s disease to progress faster. This is because the increase in cortisol levels is linked to the accumulation of beta-amyloid plaques.
- Hypercholesterolemia: occurs when cholesterol levels in the body are high. It increases the risk of Alzheimer’s disease because the circulation of high levels of cholesterol in the blood leads to an increase in the accumulation of beta-amyloid plaques.
- Diabetes: diabetes weakens the blood vessels, which increases the likelihood of the patient having mini-strokes in the brain, causing forms of dementia. A high intake of simple sugars can make brain cells insulin resistant, which could cause the brain cells to die.
Long-term diabetes—either type 1 or type 2—has many consequences for the brain and neurons in the brain. A high level of glucose in the blood can cause the brain to shrink. It can also lead to small-vessel disease, which restricts blood flow in the brain, causing problems in thinking and cognition. If small vessel disease is severe enough, it can promote the development of vascular dementia.
- Harmful lectins: harmful lectins may cause a glycation reaction that may be a significant factor in amyloid plaque development. The glycation reaction—an interaction between sugars and proteins—leads to arterial and brain damage. The more the arteries are damaged, the worse the circulation to the brain becomes. This leads to less nutrient supply to the brain, causing brain cells to starve and die, contributing to the development of Alzheimer’s disease.
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