Foods and Nutrition 1021 Lecture Notes - Lecture 7: Shift Work, Osteoporosis, Pinto Horse

• School: Western University
• Department: Foods and Nutrition
• Course: Foods and Nutrition 1021
• Professor: Noelle Martin

Document Summary

Needed in minute amounts: variation between males and females. Only disease a vitamin can cure is one that is caused by vitamin deficiency. Factors that destroy vitamins: acids, bases, oxygen, uv light, heat. Compounds in foods converted to active vitamins. Because fat soluble, they are carried as though they are fats. Absorbed into the lymph, travel in the blood in association with protein carriers. Stored in the liver and body tissues. May be toxic in excess from supplements (a,d,k) Deficiencies occur with low intake (low fat diet) or fat malabsorption. Dissolve in water cooking and washing with water can easily leach them out of foods. Easily absorbed into the bloodstream and excesses excreted in the urine. Seldom reach toxic levels (high doses of supplements = expensive urine) Three active forms in the body: retinol stored in the liver, retinal and retinoic acid converted by cells from retinol.