The origin of the need for standard nutrient intake requirements stemmed from a need to strengthen the U.S. national defense during World War II. In 1943, the Recommended Dietary Allowances (RDAs) were established to provide nutrient intake recommendations for good health. RDAs were developed by the Food and Nutrition Board of the National Academy of Sciences to provide a framework of recommended intake levels of essential nutrients to meet the needs of healthy individuals. The Dietary Reference Intakes (DRI) represent the contemporary set of reference nutrient intake levels previously defined by the RDA. A thorough examination of the available research literature was done to establish the specific nutrient intake levels. When inadequate data were available, scientific judgment was used to determine the safe and ...

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