What have you learned is the cause? Some say it is a form of diabetes of the brain.
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The cause is not known. They found that the amyloid creating the plaques was chemically corrupted. The body creates amyloid to heal the brain. In MS studies, researchers found that amyloid-beta would cure MS in mice. After 13 years, they still haven't tested it on humans. (no money to me made.) I suspect chemically pure amyloid would also cure Alzheimer's.