For more than 50 years, nutrition experts have produced a set of nutrient and energy standards known as the Recommended Dietary Allowances (RDA). A major revision is currently underway to replace the RDA. The revised recommendations are called Dietary Reference Intakes (DRI) and reflect the collaborative efforts of both the United States and Canada. Until 1997, the RDA were the only standards available and they will continue to serve health professionals until DRI can be established for all nutrients. For this reason, both the 1989 RDA and the 1997 DRI for selected nutrients are presented here.
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