A New Approach to Vitamin A Activity and Dietary Fiber

The Recommended Dietary Allowances (RDAs), established by the Food and Nutrition Board of the Institute of Medicine/The National Academies since 1941, have been applied in many situations—from serving as the basis for nutrition labeling to assessing adequate intakes—some of which were not scientifically appropriate based on how the RDAs were derived.

In addition, the expectation that RDAs were only for nutrients which could be shown to produce deficiency signs in humans limited their use in provi…