While it is absolutely true that the vast majority of "memory enhancing" supplements are highly dubious, it's also true that over the last 20 years there's been increasing scientific study of the complex interactions between diet and cognitive function. The BPNRC under the leadership of professor David O. Kennedy, for example, has carried out extensive studies of various micro-nutrients, and researchers in the USA, Europe, and Australia/New Zealand have likewise looked at the short and long term effects of individual compounds such as the range of B vitamins, magnesium, and zinc. As most people consume a very inadequate diet (lots of calories, minimal nutrition) it's been shown that modest supplementation with omega-3 fatty acids and the aforementioned compounds can significantly enhance working memory and long term memory retrieval. In combination with "use it or lose it" cognitive exercises, it may be possible to some degree to offset age-related cognitive impairment.

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