Beta-amyloid plaque in the brain is related to diets high in cholesterol and fat and Alzheimer’s.

Diets high in cholesterol and fat might speed up the formation of beta-amyloid plaques in the brain. These sticky protein clusters are blamed for much of the damage that occurs in the brains of people with Alzheimer’s.

Info source:  http://www.health.harvard.edu/mind-and-mood/boost-your-memory-by-eating-right