NUTR 125 Lecture Notes - Lecture 23: Vitamin A Deficiency, Vitamin K, Megavitamin Therapy
Document Summary
Vitamin d deficiency: bowed legs of rickets. Substances found not to be essential were dropped. B vitamins were thought to be one vitamin; turned out to be many (b1, b2, b3) Get your vitamin from the sun (vitamin d) Gut bacteria makes vitamin k and biotin. Vitamins as drugs: niacin (lipid lowering, megadose (. 3-10x higher dose) Most synthesized vitamins work equally well in the body: vitamin e is an exception, interestingly synthetic folic acid is 1. 7x more potent than natural form. Definition: essential organic substances needed in small amounts in the diet for normal function, growth, and maintenance of the body. Produce deficiency symptoms when missing from diet. Fat soluble vitamins: a,d,e,k, not readily excreted (except vitamin k) Water soluble vitamins: b,c, generally lost from the body(except vitamins b-6 and b-12, excreted via urine. Fat soluble vitamins: can accumulate in the body. Water soluble vitamins: some can cause toxicity (15-100x more)
