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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    $\begingroup$ 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. $\endgroup$ – Christian Hummeluhr Mar 31 '13 at 9:33
  • $\begingroup$ @Christian Hummeluhr yes, but I've used that world because i wanted to obtain any answer to have start point for future questions/reaserch $\endgroup$ – Qbik Apr 2 '13 at 22:16
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    $\begingroup$ I found that a buildup of homocysteine in the brain can lead to negative cognitive effects. It is metabolized using vitamins B6 and B12. $\endgroup$ – Alex Stone Jun 17 '15 at 20:45
  • $\begingroup$ 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 $\endgroup$ – Qbik Jun 29 '15 at 19:19