Recommended Daily Allowance

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Recommended Daily Allowance

Nutrient recommended allowances are amounts that should be ingested as part of a healthy diet. As a result, any element that effects the absorption of food nutrients or the efficiency with which they are utilised must be considered. For some nutrients, a portion of the requirement can be supplied by consuming a substance that is then transformed to the essential nutrient in the body. Some carotenoids, for example, are precursors of vitamin A; because dietary carotenoids can meet some or all of the vitamin A requirement, the efficiency with which these precursors are transformed into vitamin A must be considered.

The protein allowance is calculated as if it were the RDA for a single dietary component. It is, in fact, the sum of varied requirements for multiple amino acids found in varying quantities in diverse dietary proteins. Many nutrients are incompletely digested, absorbed, or both, and dietary recommendations must account for the percentage of the ingested material that is not absorbed. The absorption of heme and nonheme iron, for example, differs; it is influenced by other dietary components that are taken into account when determining the RDA. From nutrient to nutrient, the relative relevance of such components varies.

From nutrient to nutrient, the relative relevance of such components varies. As a result, the extent to which the RDA (recommended daily allowance) exceeds the physiological requirement differs by nutrient.

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