Seniors were followed for 5 years to determine if nutritional supplements might impact cognitive function. Study participants were randomized to receive long-chain polyunsaturated fatty acid supplements (omega-3s) and/or lutein/zeaxanthin, or a placebo. Over the course of the study the annual change in cognition did not differ significantly between groups. Nutritional supplements are not food, and short-term studies over a wide range of issues have failed to show benefits.
PositiveTip: Adherence to a healthy, plant-based diet for a lifetime appears to benefit cognitive function in the elderly.
Reference: http://jama.jamanetwork.com/article.aspx?articleid=2429713