Hundreds of studies have found that Omega-3 fish oil is excellent for brain health. A recent study published in the American Journal of Preventative Medicine found that regular fish consumption actually creates more voluminous brains (more gray matter), protecting individuals from Alzheimer’s disease. The subjects who consumed fish just once a week had hippocampuses that were 14% larger than those who did not consume fish once a week. If you dislike fish, consider an Omega-3 fish oil supplement, to help prevent cognitive decline.
Raji et al., Am J Prev Med. 2014 Jul 29 published online.