Fish oil elevated the level of a protein that prevents the formation of amyloid, the tell-tale protein found in Alzheimer's.

https://www.sciencedaily.com/releases/2007/11/071107211036.htm

Staving Off Alzheimer's Disease With The Right Diet, Prescriptions

2007

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New studies reveal the effects of environmental substances on the promotion or slowing of symptoms associated with Alzheimer's disease.

Drug screening has identified three antihypertension drugs capable of preventing Alzheimer's-like degeneration of nerve cells in the brain.

Fish oil elevated the level of a protein that prevents the formation of amyloid, the tell-tale protein found in Alzheimer's.

Caffeine reversed memory impairment in animal models of the disease.

In addition, environmental copper reduced the clearance of amyloid, from the brain to blood.