Nutrition Chapter 6 - Nutrition Chapter 6-Vitamins Vitamin...

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Nutrition Chapter 6-Vitamins 03/03/2008 16:06:00 Vitamin A- Functions of Vitamin A o Essential to proper vision o Cell differentiation The process by which cells mature and specialize Development of T lymphocytes of the immune system Sperm production and fertilization Bone growth Recommended intake o RDA is 900 micrograms/day for men o 700  micrograms/day for women o expressed as retinol activity equivalents (RAE) Sources of Vitamin A o Obtained from animal sources (liver, eggs) and plant sources (dark  green, orange and deep yellow fruits and vegetables) Deficiency diseases o Keratinization of skin o Xerosis and xerophthalmia o Infections o Weak bones, poor teeth Beta-Carotene
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Is a carotenoid o Carotenoids in general are known to: Protect cell membranes against damage Enhance the immune system In the class of chemicals called carotenoids o A provitamin Provitamins are inactive precursors that must be converted to  active forms in the body Is the pre-cursor of retinol Vitamin A is readily created in the body by conversion of its precursor form, beta- carotene You can’t OD on beta-carotene, although it will turn you yellow Populations with adequate beta carotene intake have lower rates of macular 
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Nutrition Chapter 6 - Nutrition Chapter 6-Vitamins Vitamin...

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