Dietary Requirements for Vitamin A

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The Food and Nutrition Board of the Institute of Medicine has made new recommendations of vitamin A intake by life stage and gender group (Table 2) (246). These Dietary Reference Intakes (DRIs) are reference values that are quantitative estimates of nutrient intakes to be used for planning and assessing diets in apparently healthy people and include Recommended Dietary Allowances (RDAs), Estimated Average Requirement (EAR), and Adequate Intake (AI) (246). The RDA is defined as "the dietary intake level that is sufficient to meet the nutrient requirement of nearly all (97 to 98 percent) healthy individuals in a particular life stage and gender group." The EAR is defined as "a nutrient intake that is estimated to meet the requirement of half of the healthy individuals in a life stage and gender group." AI is defined as "a recommended intake value based on observed or experimentally determined approximations or estimates of nutrient intake by a group (or groups) of healthy people that are assumed to be adequate—used when an RDA cannot be determined" (246).

Table 2

Dietary Reference Intakes for Vitamin A (pg RAE/d)

Table 2

Dietary Reference Intakes for Vitamin A (pg RAE/d)

Age and gender category

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