121slide11 - © 2006 Thomson Vitamins and Metabolism •...

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Unformatted text preview: © 2006 Thomson- Vitamins and Metabolism • Vitamins and minerals – Are required for proper metabolism – Do not directly provide energy – Are necessary for obtaining energy from the macronutrients – Often function as coenzymes © 2006 Thomson- Vitamins and Metabolism Figure 10.2 The Water-Soluble Vitamins • Vitamin C and the B Vitamins – Cooking and washing with water leaches them out of food – Easily absorbed – Excess easily excreted in urine The Water-Soluble Vitamins • Advice for meeting needs – Choose foods that are rich in water-soluble vitamins to achieve the recommended intakes over 3 days’ time The Water-Soluble Vitamins • Toxicity – Never from food – Can occur from the large doses concentrated in some vitamin supplements – Expensive urine -$$$$$ © 2006 Thomson- The Water-Soluble Vitamins • Deficiency – After about 6 weeks of a deficient diet The B Vitamins • B vitamins act as part of coenzymes – A small molecule that combines with, and activates, an enzyme © 2006 Thomson- Vitamins and Metabolism Figure 10.1 The B Vitamins • B Vitamins’ Role in Metabolism – Metabolism of carbohydrates, lipids, and amino acids © 2006 Thomson- Thiamin (B1) Functions Thiamin Deficiency Beriberi • Loss of sensation in the hands and feet, muscular weakness, advancing paralysis, abnormal heart action • Death via heart failure Thiamin Deficiency • Wernicke-Korsakoff Syndrome © 2006 Thomson- Thiamin RDA: – Men: – Women: Toxicity? Thiamin Sources © 2006 Thomson- Thiamin Riboflavin (B2) Function – Coenzyme in carbohydrate energy metabolism Riboflavin Deficiency • Smooth tongue, cracking at corners of mouth, fatigue • At risk: – Children who lack milk products and meat © 2006 Thomson- Riboflavin RDA: • Men: • Women: Toxicity? Riboflavin Sources © 2006 Thomson- Riboflavin Niacin(B3) Function – Coenzyme in many energy metabolism reactions Niacin Deficiency • Pellagra – Diarrhea – Dermatitis – Dementia – Death Niacin • At risk for pellagra: – Poorly nourished people • Particularly those with alcohol addiction © 2006 Thomson- Niacin • RDA – Men: – Women: Niacin...
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121slide11 - © 2006 Thomson Vitamins and Metabolism •...

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