Nutrient Functions And The Indicators Used To Estimate Requirements

Vitamin A functions to maintain normal reproduction, vision, and immune function. A deficiency of vitamin A, although uncommon in North America, can result initially in abnormal dark adaptation (night blindness) followed by xerophthalmia. The method used to set an Estimated Average Requirement (EAR) for vitamin A is based on a computational analysis to assure adequate body stores of vitamin A. The Recommended Dietary Allowance (RDA) for adults for vitamin A is set at 900 |ig RAE/day for men and 700 |0,g RAE/day for women. One |0,g rctinol activity equivalent (jxg RAE) is equal to 1 |ig all-ira??,.v-rcUnol, 12 |ig (3-carotene, and 24 pg a-carotcnc or (3-cryptoxanthin.

Vitamin K"functions as a coenzyme in the synthesis of the biologically active form of a number of proteins involved in blood coagulation and bone metabolism. Because of the lack of data to set an


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