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ter this discovery had been made, many cereal grain products were fortified with niacin and pellegra became only a minor health problem.
Similar research led to the discoveries that some 40 substances in foods - vitamins, minerals, amino acids - were essential nutrients. By the early 1940s, human requirements for many of these had been determined and Recommended Dietary Allowances for them were proposed. Also, foods had been shown to differ greatly in their content of the different nutrients. The I'SDA used this information to prepare food guides for the public. These
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