Researchers do not yet know the cause of Alzheimer's disease. The most important risk factor appears to be age. According to the National Institute on Aging, the number of people with Alzheimer's doubles every 5 years after the age of 65. (NIA Abstract, 2002) Another risk factor or cause of Alzheimer's appears to be family history. A family form, or familial Alzheimer's disease, is a rare form of Alzheimer's that usually occurs earlybetween the ages of 30 and 60--and can be inherited. The more common form of Alzheimer's, which occurs later in life, does not have an obvious link to family history.
However, one risk factor for this type of Alzheimer's disease is a protein or gene called the apolipoprotein E or the apoE gene. ApoE helps carry cholesterol in the blood. The apoE gene has three... [continues]
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