HLSC 2P91 Lecture Notes - Lecture 6: Pyridoxine, Glycolysis, Ketone Bodies
3 Nov 2016
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Document Summary
60% of the body fluid and electrolyte balance. Essential: vit a deficiency = cause blindness lack of niacin = cause dementia lack of vit d= impacts bone growth. Differ from macronutrients in structure, function and content. Bioavailability: efficiency of digestion, previous intake/status, other food consumed, preparation of food, and source. Precursors: provitamins (eg. beta-carotene, converted in the body to active form. Hydrophobic vitamins: absorption- lymph then blood, transport- protein carriers, storage- adipocytes, excretion- tends to remain stored, toxicity- likely, requirements- periodic (weeks, months) Includes vitamin e & a (oxidative protection), d (bone health), k (blood health) Hydrophilic vitamins: absorption- blood, transport-free, storage- water filled areas of body, excretion- urine, toxicity- possible, requirements- daily. Includes b vitamins: thiamin (b1), riboflavin (b2), niacin (b3), b6, folate/folic acid, b12, pantothenic acid, biotin (all responsible for energy metabolism). Q: one of the primary differences between vitamins and minerals. Ans: minerals are indestructible, vitamins are susceptible to damage.
