Chapter 7 Slides

Chapter 7 Slides - Chapter7 Vitamins HPEB502 Fall2011...

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Chapter 7 Vitamins HPEB 502 Fall 2011
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What Are Vitamins? Vitamins are essential micronutrients. Discovered about 100 years ago Tasteless, organic compounds needed in small  amounts Do not supply calories A deficiency will cause  symptoms. Consuming too much of some vitamins will cause      .
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Fat Soluble or Water Soluble Vitamins are either fat-soluble or water-soluble. Fat-soluble vitamins: A, D, E and K  absorbed with dietary fat and can be stored in body. excesses stored in fat-storage sites absorbed with water and enter the bloodstream  directly. not stored in body, but excesses still harmful
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Categorizing  the Vitamins:  Fat-Soluble  and Water- Soluble Figure 7.1
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Vitamins Can Be Destroyed by  Air, Water, or Heat Proper food preparation techniques can reduce loss. Four tips to remember:
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What Are Antioxidants?  Compounds that neutralize free radicals that can  cause oxidative stress and cell damage Examples: vitamins C and E, the mineral selenium, and  carotenoids (e.g. beta-carotene) and flavonoids Damaging effects of free radicals contribute to: heart  disease, cancer, aging, diabetes, arthritis, macular  degeneration, cataracts Both the AHA and NCI recommend obtaining  antioxidants from a well-balanced diet and do not  advocate taking supplements.
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What Are Vitamins? Vitamins differ in  bioavailability , which is the degree to  which a nutrient is absorbed from foods and used in the  body Vitamins can be destroyed by air, water, or heat Don’t expose your produce to air A little water is enough Reduce cooking time Keep your food cool Overconsumption of some vitamins can be toxic Provitamins  can be converted to vitamins by the body
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More on Fat-Soluble Vitamins 1. Any disorder that interferes with fat digestion  or absorption can lead to a  2. Do not have to be eaten every day because  they are stored in 
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Vitamin A Vitamin A:  retinoids (retinol, retinal, retinoic acid) Preformed vitamin A only found in animal foods: Some plants contain provitamin A carotenoids, which  are converted to retinol in your body. Carotenoids , including  , are pigments  which give color to carrots, cantaloupe, sweet potatoes,  spinach, broccoli. Like fat-soluble vitamins, absorbed more efficiently if fat is  present in intestinal tract
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More About Vitamin A Functions: 1. Essential for healthy eyes Component of rhodopsin and iodopsin, light-sensitive  proteins needed for vision 2. Involved in cell differentiation, reproduction and  immunity by promoting gene expression for: Healthy skin, mucus membranes
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Chapter 7 Slides - Chapter7 Vitamins HPEB502 Fall2011...

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