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, Christiaan, Krysta, caseyr547, Chuck Sherrington Mar 21 '15 at 18:38
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