Chapter 7 - Chapter 7 Vitamins HPEB 502 Spring 2011 What...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 7 Vitamins HPEB 502 Spring 2011 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 . 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 Water-soluble vitamins are B vitamins & vitamin C absorbed with water and enter the bloodstream directly. not stored in body, but excesses still harmful Categorizing the Vitamins: Fat-Soluble and Water- Soluble Figure 7.1 Vitamins Can Be Destroyed by Air, Water, or Heat Proper food preparation techniques can reduce loss. Four tips to remember: 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 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 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 Bone and teeth growth Fetal development White blood cells to fight harmful bacteria 3. Needed by all epithelial tissue Vitamin A is Essential for Healthy Eyes Beta Carotene This vitamin A precursor is linked to age-related blindness Those who do not consume enough beta-carotene through orange and dark green fruits and vegetables are at increased risk of developing (an untreatable, age-related loss of vision that leads to blindness) Vitamin A Needs Daily needs: Adult males: 900 micrograms (g) retinol activity equivalents (RAE) Adult females: 700 g RAE Vitamin A deficiency around the world A problem among millions of children worldwide affecting their eyesight and susceptibility to infection Too Much or Too Little Vitamin A Excessive amounts of preformed vitamin A can accumulate to toxic levels. Upper limit for adults: 3,000...
View Full Document

This note was uploaded on 01/05/2012 for the course HPEB 502 taught by Professor Montgomery during the Spring '09 term at South Carolina.

Page1 / 59

Chapter 7 - Chapter 7 Vitamins HPEB 502 Spring 2011 What...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online