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Recommended dietary allowances (RDAs) are the levels of essential nutrients that the Food and Nutrition Board has judged meet the known nutrient needs of almost all healthy persons.
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Specific recommendations for each vitamin depend on age, gender, and other factors (such as pregnancy). The U.S. Department of Agriculture offers a PDF file that lists these recommendations.
The best way to get the daily requirement of essential vitamins is to eat a balanced diet that contains a variety of foods from the food guide pyramid.
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