From Live in the Now:
Researchers publishing the result of a study in the Journal of Alzheimer’s Disease found that eating grapes  and supplementing with grape seed extract compounds help to prevent the development and progression of Alzheimer’s dementia. This devastating form of dementia is characterized by the accumulation of beta-protein clusters in the brain known as oligomers.
A wealth of prior research studies conclude that excess oligomers poison neurons in the brain and cause memory loss associated with the disease. A number of different natural compounds, including grapes and grape extracts provide a powerful protective shield against the progressive memory loss experienced with Alzheimer’s dementia.
For more, see: Grape Seed Extract Fights Alzheimer’s