Recommended Dietary Allowances 10th Edition (1989) / Chapter Skim
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biochemical measurements of tissue saturation or adequacy of molecular function in relation to nutrient intake; (4) nutrient intakes of fully breastfed infants and of apparently healthy people from their food supply; (5)
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It contains several changes that reflect advances in scientific knowledge in the past 9 years or new interpretations of data by the subcommittee. Changes include the following: Age Groupings Because peak bone mass is probably not attained before age 25 years, the age class of 19 to 22 years has been extended through age 24 for both sexes.
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Recommended allowances for adults were calculated by using empirically derived equations recently developed by the Food and Agriculture Organization for estimating resting energy expenditure and then multiplying the results by an activity factor representing light-to-moderate activity. Energy allowances range from 2,300 to 2,900 kcal/day for adult men and 1,900 to 2,200 kcal/day for adult women.
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The basis for lowering the RDA is the recognition that diets containing about half the previous RDA maintain adequate folate status and liver stores. The folate allowance of approximately 3 fig/ kg body weight for adults and adolescents translates to 200 ~g/day for the adult male and 180 1lg/day for the adult female an amount typically consumed in the United States and Canada by adults who show no evidence of poor folate status.
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This allowance translates into RDAs for children that are considerably lower than the RDAs in the ninth edition, especially for preadolescent children. Iron In setting RDAs for iron, it was the subcommittee's judgment that a dietary intake that achieves a target level of 300 mg of iron stores meets the nutritional needs of all healthy people, since, over several months, this level of stores provides for the iron needs of a person consuming a diet nearly devoid of iron.
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The RDAs for iron are adequate for essentially all healthy people who daily consume diets containing 30 to 90 g of meat, poultry, or fish (containing highly absorbable heme iron) or foods containing 25 to 75 mg of ascorbate after preparation (to improve absorption of nonheme iron)
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This category, together with the caution that upper levels in the safe and acloquate range should not be habitually exceeded because the toxic level for many trace elements may be only several times usual intakes, is maintained in the present edition. The table that includes this group of nutrients is similar to the corresponding table in the ninth edition, but incorporates several changes reflecting advances in scientific knowledge or new interpretations of data by the subcommittee.
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Since current dietary intakes of manganese appear to satisfy requirements, a recent survey showing the mean manganese intake of 2.7 and 2.2 mg for adult men and women, respectively, provides justification for the change. Molybdenum The estimated safe and adequate range of molybdenum intake for adults and adolescents of 75 to 250 ~g/day is based on average reported intakes; the ranges for other age groups are derived from extrapolation on the basis of body weight.
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Such diets are entirely consistent with the type of dietary patterns advocated in the Food and Nutrition Board's report entitled Diet and Health to promote health and reduce risks of developing major chronic diseases. Together, the RDAs and the Diet and Health recommendations should be considered the appropriate basis for diet planning.
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