Vitamin D Deficiency in Gastrointestinal Disease
نویسندگان
چکیده
52 VITAMIN D—BIOMOLECULAR CHARACTERISTICS There are two ways of acquiring vitamin D—cutaneous irradiation and diet. In the skin, cholecalciferol is synthesized through UV irradiation of 7-dihydrocholesterol. In infants, immobile or institutionalized persons, the elderly (>70 years old), and veiled women or those living in northern latitudes, sun radiation may not be a sufficient source of vitamin D and dietary supplementation is essential. For that reason, various foods, such as milk and infant formula in the United States and other developed countries are fortified with vitamin D3 (cholecalciferol) or D2 (ergocalciferol), the latter being of plant derivation (Figure 1). Dietary vitamin D is absorbed through the small intestine as a fat-soluble vitamin along with Vitamin D Deficiency in Gastrointestinal Disease NUTRITION ISSUES IN GASTROENTEROLOGY, SERIES #36
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