Foods and Nutrition 1021 Lecture Notes - Lecture 13: Epithelium, Window Screen, Tryptophan

• School: Western University
• Department: Foods and Nutrition
• Course: Foods and Nutrition 1021
• Professor: Jennifer Broxterman

Document Summary

Definitions & classification of vitamins: vitamins, organic compounds vital to life. Indispensable to body functions: needed in minute amounts, non-caloric essential nutrients, the only disease a vitamin can cure is the one caused by a deficiency of that vitamin, precursors/provitamins, compounds in foods converted to active vitamins. Characteristics of fat-soluble vitamins: vitamins a, d, e, k, absorbed into the lymph, travel in the blood in association with protein carriers, dissolve in lipid. Nov 28, 2016: require bile for absorption, stored in the liver and body tissues, may be toxic in excess from supplements (a, d, k, deficiencies occur with low intake or fat metabolism. If deficient in vitamin a: lack of recovery of vitamin a = flash of light occurs = night blindness. Vitamin a recommendations: amount of vitamin a needed is proportional to body weight, rda, 700 mg rae/day (females, 900 mg rae/day (males)