Chapter 9 - Chapter 9 Vitamins: What is a vitamin? Vitamins...

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Chapter 9 Vitamins:
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What is a vitamin?
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Vitamins Vita-Vital; amin(e): ? Do not provide energy (kcals) Assist with release of energy (coenzymes)
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Types of vitamins Water-soluble? Fat-soluble?
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Provitamins Precursors of vitamins Beta-carotene (sources?) Inactive vitamin A Antioxidant Tryptophan converted to niacin (B3)
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Water Soluble Vitamins Water Soluble Vitamins Absorbed and transported freely in blood Excess excreted in the urine Toxicity with over supplementation Must be consumed on a regular basis No body storage
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Are You Getting a VARIETY of Vegetables?
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Vitamin C: Ascorbic Acid Deficiency = scurvy Absorption decreases with increased intake Greater needs for smokers Toxicity: very low
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Function 1) Potent Antioxidant (watery parts of cell) Protects against cancer and premature aging 2) Production of collagen Skin, joints, enhanced wound healing, stronger blood vessel 3) Carnitine production - promotes fat use by the Kreb’s cycle - enhance endurance in athlete
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Function 4) Serotonin metabolism Happier mood 5) Immune function - Fewer cold - Decreases risk of cancer 6) Prevents formation of carcinogens nitrosamines - Cold cuts contain nitrate and nitrites
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Collagen= Cement
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Can you drink collagen?
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Carnitine shuttles fatty acids to Kreb’s cycle
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Food Sources of Vitamin C Vitamin C is easily destroyed by light and heat
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B-Complex Vitamins B-Complex: Thiamin ( B1 ) Riboflavin ( B2 ) Niacin (B3) Pantothenic acid (B5) Pyridoxine ( B6 ) Biotin (B7) Cobalamine ( B12 )
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B1, B2 and B3 needed for glycolysis
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B2 and B3 needed for the Kreb’s cycle
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Vitamin B 1 (Thiamin) Function: Releases energy from carbohydrates (glycolysis) Nerve function and muscle contraction: Thiamin acetylcholine muscle contraction Enhances mood (possibly because it is involved in energy production) Boosts immunity
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Deficiency Beriberi : Nerve can’t get the message to the muscle to move Muscle wasting
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“I can’t, I can’t”
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Anti-thiamin in the diet Factors that decrease thiamin availability: Raw fish (thiaminase ) Tea and coffee (Tannins) Vitamin C prevents interaction Caffeine ( increases loss) Alcohol ( prevents absorption)
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whole-grain products typically make the greatest contribution
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Chapter 9 - Chapter 9 Vitamins: What is a vitamin? Vitamins...

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