Chap.Vitamin - Chapter Six The Vitamins Vitamins Essential...

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Chapter Six - The Vitamins Vitamins : Essential in regulating body processes Fat-Soluble Vitamins Absorbed in the intestine with dietary fat Can be stored in the body Include vitamins A, D, E, and K Water-Soluble Vitamins Can be dissolved in water Include vitamin C and the B vitamins Vitamin A Three active forms are: retinol retinal retinoic acid Functions of vitamin A Essential to proper vision Cell differentiation – Development of T lymphocytes of the immune system Sperm production and fertilization Bone growth Recommended intake RDA is 900 micrograms/day for men; 700 micrograms/day for women Sources of vitamin A Obtained from animal sources (liver, eggs) and plant sources (dark green, orange, and deep yellow fruits and vegetables) Vitamin A Deficiency and Toxicity Keratinization of skin. Xerosis and xerophthalmia. Infections. Weak bones, poor teeth. Keratinization
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Vitamin A What if you consume too much vitamin A? Vitamin A is highly toxic, especially from supplements. Birth defects and permanent damage to the liver and eyes can result. What if you don’t consume enough vitamin A? Night blindness is the most common disease of vitamin A deficiency. Beta-carotene is a carotenoid. Carotenoids in general are known to: protect cell membranes against damage enhance the immune system protect skin from damage by UV light protect eyes from damage Beta-carotene is: in the class of chemicals called carotenoids a provitamin Provitamins are inactive precursors that must be converted to active forms in the body. Beta-carotene is the precursor of retinol. Beta Carotene Vitamin A is readily created in the body by conversion of its precursor form, beta- carotene. Populations with adequate beta carotene intake have lower rates of macular
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Chap.Vitamin - Chapter Six The Vitamins Vitamins Essential...

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