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Vitamin and element requirements - Institute of Medicine - RDA and AI tables

Posted by Erling 
Recommended Dietary Allowances and Adequate Intakes, Vitamins and Elements:


This footnote clarifies why certain values (e.g. potassium, sodium, chloride) are AI (adequate intake) rather than RDA (recommended daily allowance):

NOTE: This table (taken from the DRI reports, see www.nap.edu) presents Recommended Dietary Allowances (RDAs) in bold type and Adequate Intakes (AIs) in ordinary type followed by an asterisk (*). An RDA is the average daily dietary intake level; sufficient to meet the nutrient requirements of nearly all (97-98 percent) healthy individuals in a group. It is calculated from an Estimated Average Requirement (EAR). If sufficient scientific evidence is not available to establish an EAR, and thus calculate an RDA, an AI is usually developed. For healthy breastfed infants, an AI is the mean intake. The AI for other life stage and gender groups is believed to cover the needs of all healthy individuals in the groups, but lack of data or uncertainty in the data prevent being able to specify with confidence the percentage of individuals covered by this intake.

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