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Module 8: Vitamins
The B-vitamins share many common roles in the body including acting as co-factors and coenzymes in energy metabolism Vitamin B6 plays an important role in reactions that convert amino acids into other amino acidsHigh doses of vitamin C may cause diarrheaCompared to children, the vitamin D recommendations for adults are higher because do not make as much vitamin D from the sun since aging decreases skin productionVitamin C assists with the enzymes that assist in the synthesis of collagenGood sources of vitamin A include the liver Vitamin K helps promote blood clotting by promoting the conversion of prothrombin to thrombinExcessive doses of supplemental beta-carotene may result in an orange discoloration of the skinBoth vitamin B12 and folic acid deficiency can result in megaloblastic anemiaVitamin E supplements are not recommended for reducing the risk of heart disease or cancer because the scientific evidence does not support their effectivenessVitamin E deficiency is most likely to occur in people on a very low-fat diet because high fat foods are high in vitamin E Good sources of pro-vitamin A include sweet potatoes
1. List the vitamins that are fat soluble and the vitamins that are water soluble.
2. Describe the differences and similarities between fat soluble and water soluble vitamins regarding excretion, timing of dose, and likelihoodof toxicity.