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Chapter 7 vitamins
 

Chapter 7 vitamins

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    Chapter 7 vitamins Chapter 7 vitamins Presentation Transcript

    • Nutrition HO-15
    • Vitamins Water Soluble – Vitamin C & B Fat Soluble – Vitamin A, D, E & K
    • Vitamins Water Soluble – Vitamin C & B • Dissolve in water • Easily absorbed and transported • Not stored in significant quantities • Rarely toxic from food sources Fat Soluble – Vitamin A, D, E & K • Do not dissolve in water • Need fat to be absorbed • Stored extensively • Can reach toxic levels
    • Vitamin D Vitamin A Vitamin E Fat Soluble Vitamin K
    • Vitamin A Functions Vision Growth and maintenance • body linings and skin • For growth of bones and teeth Immune defenses
    • Vitamin A Deficiency Vision - > night blindness Growth and maintenance -> keratinization Immune defenses - > decreased immunity
    • Beta-carotene Pigment in plants Antioxidant Precursor to Vitamin A Converted to Vitamin A Not absorbed at a high rate
    • Retinol Activity Equivalent Accounts for retinol (better absorbed/more active) Accounts for provitamin A carotenoids (less absorbed/less active) Differs from International Units (IU)
    • Sources Retinol: yellow fat soluble substance • Animal foods: beef liver Provitamin A carotenoids • Plant sources: sweet potato, cantaloupe, red pepper
    • Vitamin E Antioxidant: quenches free radicals protects cellular structures from oxidative damage
    • Role of Vitamin D in the body? Regulation of blood calcium Regulation of phosphorus Raises blood calcium levels
    • Vitamin D Deficiency Softening of Bones Rickets
    • Vitamin D Deficiency CVD CA Cognitive Asthma DM MS HTN
    • Vitamin D Sources Sunshine! Seafood Fortified milk Egg yolk Mushrooms
    • Vitamin K K1: Synthesis of blood clotting proteins K2: Synthesis of bone proteins
    • Vitamin K Vitamin K is synthesized by bacteria in the intestines Vitamin K is given at birth because the intestines are sterile. The goal is to prevent bleeding in Vitamin K deficient newborns
    • The Gatekeeper and the Traffic Cop Vitamin D: Gatekeeper Vitamin K: Traffic Cop
    • Vitamin C Maintenance of connective tissues • Formation of collagen Cofactor in the production of carnitine Antioxidant Restores Vitamin E to it’s active form Supports the immune system Boosts Iron absorption
    • Vitamin C Deficiency Scurvy Breakdown of connective tissue
    • Vitamin C Does not prevent colds Vitamin C reduces histamine
    • B-Vitamins Work together Part of coenzymes Energy metabolism New cell synthesis
    • Thiamin deficiency results in what condition? Beriberi (affects nerves) Loss of sensation in hands and feet muscular weakness advancing paralysis
    • What condition develops in Niacin deficiency? Pellagra Diarrhea Dermatitis Dementia Death
    • Folate Deficiency Neural tube defects Fortification of food is important - Most women don’t know they are pregnant for weeks
    • B12 Deficiency Pernicious anemia Malabsorption Elderly Vegans
    • Who is at risk for Pernicious anemia? Elderly - most at risk Strict Vegetarians Vitamin B12 is only found in animal sources
    • THE END