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" ... Scientists don't know exactly how omega-3 fatty acids exert such a protective effect on the brain, but research suggests they boost the function of neurotransmitters. One study found that seniors whose blood contained high levels of omega-3 fatty acds, particularly DHA (docosahexaenoic acid) had the greatest brain volume and also tested highest on a set of memory and cognitive skills. Omega-3s are heart-healthy too, helping keep arteries clear and blood flow strong, and good circulation benefits the brain as well. While salmon is one of the best known and richest source of omega 3s, it's also not a food you want to eat every day due to the mercury content. But you can make walnuts a daily habit, sprinkling a handful on a salad or eating them as an afternoon snack. Walnuts also contain memory-protective vitamin B6 (see below). ... "