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Vitamin A - Retinol and Beta-Carotene. Retinol Pure Vitamin A Only found in animal foods. Beta-Carotene Pro-Vitamin A Converted to Vitamin A in gut wall. Vitamin A – Retinol and Beta-Carotene. Functions Regulates growth Promotes healthy skin Maintenance of healthy epithelial tissues
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Vitamin A - Retinol and Beta-Carotene Retinol Pure Vitamin A Only found in animal foods Beta-Carotene Pro-Vitamin A Converted to Vitamin A in gut wall
Vitamin A – Retinol and Beta-Carotene Functions • Regulates growth • Promotes healthy skin • Maintenance of healthy epithelial tissues • Necessary for production of Rhodopsin - pigment in retina, helps eye adapt to dim light Effects of deficiency • Restricted growth • Dry mucous membranes • Xeropthalmia - dry eye membrane/ blindness • Night blindness • Susceptibility to infection
Vitamin A - Retinol and Beta-Carotene Sources Retinol - Cod liver oil, liver, dairy products, herring, egg yolk Beta-Carotene Dark green leafy vegetables, broccoli, carrots, deep orange fruits and vegetables
Vitamin A - Retinol and Beta-Carotene Properties • Yellow • Fat soluble • Insoluble in water • Can be destroyed by oxygen, light and air • Some reduction in dehydration • Powerful antioxidant RDA See text book pg. 34
