cal information and guidance on using DRIs appropriately. Based on interaction with and information provided by the panels and subcommittees, the DRI Standing Committee determined the DRI values to be included in the reports (IOM, 1997).
The DRIs include the Estimated Average Requirement (EAR), the RDA, the Adequate Intake (AI), and the Tolerable Upper Intake Level (UL). Establishment of these reference values requires that a criterion be carefully chosen for each nutrient and that the population for whom these values apply be carefully defined. For the DRIs a requirement is defined as the lowest continuing intake level of a nutrient that, for a specific indicator of adequacy, will maintain a defined level of nutriture in an individual (IOM, 1997). The chosen criterion or indicator of nutritional adequacy upon which the EARs and AIs are based is identified for each nutrient. The criterion may differ for individuals at different life stages. Particular attention is