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What are the common nutritional deficiencies in western countries related to reduced mental performance ? I've heard about omega 3, folid acid, and vitamin D deficiencies, the last two are now reduced due to food suplementation in some countries.

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closed as too broad by Christian Hummeluhr, AliceD, Krysta, caseyr547, Chuck Sherrington Mar 21 at 18:38

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs. If this question can be reworded to fit the rules in the help center, please edit the question.

This is an interesting question, but "mental performance" is much too broad and vague a measure to be answered meaningfully, at least for me. Recommendations: 1) Add some background literature to provide context on what kind of performance you're thinking of. 2) Restrict the scope of the question to a (few) specific measure(s). Something like "What is the association between common nutritional deficiencies and working memory?" would be more amenable to answering. –  Christian Hummeluhr Mar 31 '13 at 9:33
@Christian Hummeluhr yes, but I've used that world because i wanted to obtain any answer to have start point for future questions/reaserch –  Qbik Apr 2 '13 at 22:16
I found that a buildup of homocysteine in the brain can lead to negative cognitive effects. It is metabolized using vitamins B6 and B12. –  Alex Stone Jun 17 at 20:45
I heard about selenium deficiency in some countries have very low levels of it in soil, but I'm not sure, how it influence mental functions –  Qbik Jun 29 at 19:19