Foods and Nutrition 1021 Lecture Notes - Lecture 7: Vitamin A Deficiency, Vitamin D Deficiency, Vitamin B6

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Compounds in foods converted to active vitamins. The only disease a vitamin can cure is the one caused by a deficiency of that vitamin! B vitamins (thiamin, riboflavin, niacin, folate, b12, b6, biotin, pantothenic acid) Absorbed into the lymph, travel in the blood in association with protein carriers. Stored in the liver & body tissues. Deficiencies occur with low intake or fat malabsorption. Retinal & retinoic acid (converted by cells from retinol) Deep orange fruits & dark green leafy vegetables. B-carotene in excess not toxic; turns people bright yellow/orange if eaten in excess. Rich source of b-carotene: dark green and orange vegetables. Other colorful veggies: poor sources of b-carotene. Eyesight: light perception at the retina, maintains healthy crystal-clear cornea. When light hits the eye, it bleaches the rhodopsin, A piece of vitamin a breaks off, which conveys sight to the optic center of the brain. New vitamin a is needed to replace the part that breaks off.

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