FDNS 2050 Chapter Notes - Chapter 7: Performance-Enhancing Substance, Vitamin A Deficiency, Hypervitaminosis A

• School: University of Georgia
• Department: Foods and Nutrition
• Course: FDNS 2050
• Professor: Jamie Cooper

Document Summary

Food sources: animal foods: liver, butter, fortified milk (beta-carotene: green leafy and orange/yellow veggies) Function: vision (night and peripheral), bone development, immune system, antioxidant (bind free radicals) Deficiency health: night blindness, skin lesions, impaired growth, xerophthalmia (destruction cornea) Deficiency sports: impaired: gluconeogenesis, muscle protein synthesis, night vision no data. Hypervitaminosis a: joint pain, skin peeling, bone loss, excess a in pregnancy can be teratogenic. Food sources: most food doesn"t contain (sun), fatty fish, egg yolks, mushrooms, fortified foods. D2 (ergocalciferol) and d3 (cholecalciferol) d3 recommended exposure to sun, no sunscreen, african americans need 10x more. Function: genes controlled by it and most cells have receptors for hormonal form bone metabolism parathormone secreted from parathyroid. May occur in people with little exposure to the sun leads to increased serum parathyroid which removes calcium from bones. Supplementation health: little data no effect of one mega-dose or supplementation over course of 2 years.