HUN 2201 Chapter Notes - Chapter 7: Provitamin, Blood Proteins, Chylomicron
19 Feb 2018
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They only resolve when the vitamin is restored to the diet. It takes more than a few days to develop de ciency symptoms, even when a vitamin is completely eliminated from the diet. Vitamins are found in foods from all the food groups, but some groups are low or lacking in speci c vitamins. The vitamins in foods can be damaged by exposure to light or oxygen, washed away during preparation, or destroyed by cooking. About 40-90% of the vitamins in food are absorbed, primarily from the small intestine. The composition of the diet and conditions in the digestive tract and the rest of the body in uence vitamin bioavailability. Some vitamins are absorbed in an inactive form called either a provitamin or a vitamin precursor. #1: to perform vitamin functions, provitamins must be converted into active vitamin forms once they are inside the body.
