Vitamin A
The Complete Idiot's Guide to Vitamins and Minerals
Vitamin A Guide
Updated and revised for the first time since 2000, this new edition of The Complete Idiot's Guide to Vitamins and Minerals covers all the latest research and developments in vitamins, minerals, and supplements in the last six years. It features significant new information on Vitamins A and E, folate, and glycosamine, among many others, and sets the record straight on much of the conflicting information out there on this subject.
--Covers all research and developments in vitamins, minerals, and supplements in the last six years
--Significant new information on Vitamin A and Vitamin E, folate, glycosamine, and others
For anyone interested in health and nutrition, this guide provides up-to-date information. It explores the functions, benefits, and risks of each essential vitamin and mineral, and gives accurate information about the hottest supplements, including antioxidants, DHEA, and melatonin. The book also points out which drugs and foods may block the body's absorption of important nutrients.
The Complete Idiot's Guide to Vitamins and Minerals, 3rd Edition
Anyone interested in learning about nutritional supplements should read this book! It covers all of the basics about supplements, why we need them, and what benefits they can provide us with for optimum health. You'll see all of the popular vitamins, minerals, herbs and antioxidants and a whole lot more. I strongly recommend "The Complete Idiot's Guide to Vitamins and Minerals" to anyone that has wanted to learn more about supplements, but didn't know where to find reliable information.
This book helped me to get seriously involved in the nutritional supplement field, and I make sure that I keep a copy of it readily available at all times! - Wayne Wasserman (Florham Park, New Jersey United States)
A Complete and Handy Reference Guide
Part 1: The Vital Keys to Good Health
Part 2: The A to K of Vitamins
Part 3: Minerals: The Elements of Good Health
Part 4: Exploring Other Supplements
Appendix A: A quick reference chart for common health problems such as acne, colds and insomia
Appendix B: Resources (includes addresses and phone number of that company/organization) for Finding nutritionally oriented physicians and other health care professionals in your location, Nutrition and the elderly, Testing labs, Supplement manufacturers, Supplement infomation and regulation, Federal Regulation and Industry association & help for medical problems
Appendix C: Includes a in-depth glossary of the terms throughout the book.
This book is packed with infomation and I found this book very useful.
In its introduction, the author explains briefly on why vitamins and minerals are so important for us to stay alive. Throughout the book there are plenty of charts, including many that list good food sources for the various vitamins, minerals, and other supplements. The book also gives tips on how to get the most from your foods and supplememnts, how to avoid problems like overdoses or bad interactions with other drugs or supplements. It also includes a sidebar with a duck character letting you know what supplements don't work or what to avoid because it dosen't work. - catdogkidsfirst (USA)
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Vitamin A
Vitamin A is a vitamin which is needed by the retina of the eye in the form of a specific metabolite, the light-absorbing molecule retinal. This molecule is absolutely necessary for both scotopic and color vision. Vitamin A also functions in a very different role, as an irreversibly oxidized form retinoic acid, which is an important hormone-like growth factor for epithelial and other cells.
In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to an alcohol (retinol) in the small intestine. The retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal. The associated acid (retinoic acid), a metabolite which can be irreversibly synthesized from vitamin A, has only partial vitamin A activity, and does not function in the retina or some essential parts of the reproductive system.
All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group. This structure is essential for vitamin activity. Carolyn Berdanier. 1997. Advanced Nutrition Micronutrients. pp 22-39 The orange pigment of carrots - beta-carotene - can be represented as two connected retinyl groups, which are used in the body to contribute to vitamin A levels. Alpha-carotene and gamma-carotene also have a single retinyl group which give them some vitamin activity. None of the other carotenes have vitamin activity. The carotenoid beta-cryptoxanthin possesses an ionone group and has vitamin activity in humans.
Vitamin A can be found in two principal forms in foods:
*retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester. It is also commercially produced and administred as esters such as retinyl acetate or palmitate.
*The carotenes alpha-carotene, beta-carotene, gamma-carotene; and the xanthophyll beta-cryptoxanthin (all of which contain beta-ionone rings), but no other carotenoids, function as vitamin A in herbivores and omnivore animals, which possess the enzyme required to convert these compounds to retinal. Carnivores in general are poor converters of ionine-containg carotenoids, and pure carnivores such as cats and ferets lack beta-carotene 15,15'-monooxygenase and cannot convert any carotenoids to retinal (resulting in none of the carotenoids being forms of vitamin A for these species).
Books about Vitamin A
The New Encyclopedia of Vitamins, Minerals, Supplements, and Herbs: How They Are Best Used to Promote Health and Well Being
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Vitamins, Herbs, Minerals, & Supplements: The Complete Guide
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Nutrient A-Z: A User's Guide to Foods, Herbs, Vitamins, Minerals & Supplements
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Fight Cancer with Vitamins and Supplements: A Guide to Prevention and Treatment
Release Date: 05/01/2001
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Vitamins, Minerals, and Dietary Supplements (The Nutrition Now Series)
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