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Parameters[ edit ] DRI provides several different types of reference values: Recommended Dietary Allowances RDA , the daily dietary intake level of a nutrient considered sufficient by the Food and Nutrition Board of the Institute of Medicine to meet the requirements of The definition implies that the intake level would cause a harmful nutrient deficiency in just 2. Adequate Intake AI , where no RDA has been established, but the amount established is somewhat less firmly believed to be adequate for everyone in the demographic group. Tolerable upper intake levels UL , to caution against excessive intake of nutrients like vitamin A that can be harmful in large amounts. This is the highest level of daily nutrient consumption that is considered to be safe for, and cause no side effects in, The definition implies that the intake level would cause a harmful nutrient excess in just 2. Used for sources of energy, such as fats and carbohydrates. Composition of diets for schools, prisons, hospitals or nursing homes Industries developing new foods and dietary supplements Healthcare policy makers and public health officials History[ edit ] The recommended dietary allowance RDA was developed during World War II by Lydia J. Roberts , Hazel Stiebeling , and Helen S. Mitchell , all part of a committee established by the United States National Academy of Sciences in order to investigate issues of nutrition that might "affect national defense". The standards would be used for nutrition recommendations for the armed forces, for civilians, and for overseas population who might need food relief. Roberts, Stiebeling, and Mitchell surveyed all available data, created a tentative set of allowances for "energy and eight nutrients", and submitted them to experts for review Nestle, The allowances were meant to provide superior nutrition for civilians and military personnel, so they included a "margin of safety. In the early s, United States Department of Agriculture nutritionists made a new set of guidelines that also included the number of servings of each food group in order to make it easier for people to receive their RDAs of each nutrient. DRIs were published over the period to In , revised DRIs were published for calcium and vitamin D. Amounts and "ND" status for other age and gender groups, pregnant women, lactating women, and breastfeeding infants may be much different. EARs have not yet been established or not yet evaluated. ULs could not be determined, and it is recommended that intake from these nutrients be from food only, to prevent adverse effects.
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