NTR_300_Vitamins - Fundamentals of Nutrition The Vitamins...

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1 Fundamentals of Nutrition Fundamentals of Nutrition The Vitamins The Vitamins NTR-300 Dr. WH Turnbull Unless otherwise stated, all slides and information are derived from: Food Nutrition & Diet Therapy and Krause's Food & Nutrition Therapy, 11th 12th Edns ., 2004 & 2008. By Perspectives in Nutrition, 7th Ed., 2007. By Wardlaw & Hampl, Publ. Mc Graw Hill
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2 Objectives Objectives Vitamins: To have a basic knowledge of the classifications, functions, sources, requirements, regulation and content in the body, their interactions between them and deficiency/toxicity ranges, and related substances.
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3 Vitamins - General Vitamins - General An essential, non caloric, organic nutrient needed in tiny amounts by the body. Make possible the processes by which other nutrients are digested, absorbed, and metabolized or built into body structures.
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4 Vitamins Vitamins Precursor or provitamins – are a form of some vitamins that once inside the body are transformed chemically into one or more active vitamin forms. When measuring amounts of vitamins in food, it is most accurate to determine the amount of the true vitamin (not the precursor) and also the vitamin’s activity potential from its precursors.
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5 Classes of Vitamins Classes of Vitamins 1. Water soluble 2. Fat soluble Solubility - determines how vitamins are absorbed and transported by the bloodstream; whether they can be stored in the body; and how easily they are lost from the body.
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6 Fat Soluble Vitamins Fat Soluble Vitamins Includes vitamins A, D, E, and K Absorbed into the lymph and they travel in the blood in association with protein carriers. Can be stored with other lipids in fatty tissues. Some can build up to toxic concentrations.
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7 Water Soluble Vitamins Water Soluble Vitamins Includes the B vitamins: Thiamin, Riboflavin, Niacin, Vit B 6 , Folate, Pantothenic Acid, Biotin, Vit B 12 , and Vit C. Generally absorbed directly into the bloodstream. Excesses are excreted into the urine, and most are not stored in large amounts in tissues. Risk of toxicity is rare –except extremely high doses (supplements).
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8 The Fat Soluble Vitamins The Fat Soluble Vitamins
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9 The Fat Soluble Vitamins The Fat Soluble Vitamins Generally occur together in the food with fats/oils. Require bile for absorption (same as fat). Once absorbed, stored in the liver and fatty tissues until needed. Humans can survive weeks, months or longer without these vitamins in the diet because they are stored. Risk of toxicity is high because of storage capabilities.
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10 Fat Soluble Vitamin Fat Soluble Vitamin Deficiencies Deficiencies Likely when diet is consistently low in these vitamins. Fat malabsorption can bring about
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This note was uploaded on 11/21/2011 for the course PUBH 1517 taught by Professor Paula.goldberg during the Winter '11 term at Life Chiropractic College West.

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NTR_300_Vitamins - Fundamentals of Nutrition The Vitamins...

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