Vitamin D 2010 - Vitamins organic substances needed in...

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Fat-Soluble Vitamins Vitamins : organic substances needed in small amounts in the diet for normal growth, function and maintenance of body tissues From: Insel, Turner and Ross; Nutrition, 2nd Edition
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Understanding Vitamins A few myths… – If a little is good, then a lot is better. – Vitamins are energy boosters. – Vitamins work exclusively of one another. Vitamins in Foods – Natural sources: all food groups – Enriched and fortified foods
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Vitamins Fat-Soluble – Vitamins A, D, E, K – Absorbed like fat into lymphatic system – Stored in larger quantities, therefore, toxicities may occur – May have precursors – Less vulnerable to cooking losses Water-Soluble 8 B-vitamins and vitamin C Absorbed into bloodstream Stored in small amounts Vulnerable to cooking losses
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Vitamins - general information Vitamins are generally indispensable because they can’t be synthesized in sufficient quantities to meet individual need. When vitamin intake is insufficient, a deficiency occurs, accompanied by a measurable decline in health. If the deficiency is not too far advanced, the symptoms disappear when the vitamin is restored to the body Vitamins may also be used as pharmacological agents in treating non deficiency diseases. Plant and animal foods supply vitamins in the human diet. Differences between food-derived and chemically synthesized vitamins?
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Vitamin Absorption From: Insel, Turner and Ross; Nutrition, 2nd Edition
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Vitamin D - historical perspective An understanding of the causative factors responsible for rickets (1910 - 1930). Sir Edward Mellanby working with dogs raised indoors and used diet studies to show rickets was caused by a trace component in the diet. Showed cod liver oil is an excellent antirachitic agent. In the 1920s Hess and Weinstock showed irradiated skin produces Vitamin D. Steenbock and Black found that irradiated rat food was antirachitic
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Rickets can result from insufficient vitamin D in the diet or from insufficient amounts of ultraviolet radiation from the sun. Rickets can lead to skeletal deformation, such as vertebral or leg curvature. This X ray reveals bone deformation due to rickets. Nutritional Childhood Rickets Today this type of rickets is rare in developed countries. Children growing up in poor communities where vitamin D-rich foods may be scarce are the most susceptible to rickets. Vitamin D Deficiency.
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