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American Dietetic Association has found vegan diets adequate for fulfilling nutritional needs during pregnancy , but pregnant women and nursing mothers should supplement their diets with vitamins B12 and D.36 Most doctors also recommend that pregnant women supplement their diet with iron and folic acid , although vegetarians normally consume more folic acid than meat-eaters . Nutritional yeasts are not live yeast cells . The CNPP is the focal point within USDA where scientific research is linked with the nutritional needs of the American public . It is necessary to demonstrate that the supplement improved the nutrition status of children in order to infer that associations between supplementation and behavioural outcomes are nutritional . The Ross segment includes a broad line of pediatric and adult nutritionals . Psychometric indicators could be expected to be much less sensitive to nutritional effects than length , and therefore even more children would be necessary to demonstrate nutritional effects of diet on mental development . The organization 's volunteers who accompanied the airlifts report that orthopedic supplies , antibiotics , nutritionals and pediatric vitamins are all in high demand .