HNF 150 Lecture Notes - Lecture 17: Negative Feedback, Retinol, Tocopherol
Document Summary
Vitamins: what is a vitamin, dietary essential organic (contain carbon) compounds, need small amounts compared to our macronutrients, not an energy source (negligible kcal) but help us use energy. Examples: energy metabolism, growth, development and maintenance of body tissues: types of vitamins, fat-soluble, vitamin a, vitamin d, vitamin e, vitamin k, water-soluble, b vitamins (thiamin*, riboflavin*, niacin*, folate*, vit b12*, biotin, pantothenic. * learn these vitamins: absorption, transport, and storage of vitamins. Lecture notes: stored in liver and adipose tissues, more likely to be toxic than water-soluble vitamins, toxicity rarely from food, typically from high-dose supplements (exception: k is rarely toxic, only a little is stored in the liver) Water-soluble vitamins: digestion and absorption, digestion: cleave from protein in stomach, absorbed from small intestine to blood, storage in body tissues is minimal, small amounts stored in variety of tissues. & organs: best to eat average requirements over 3 days.