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Vitamin A Deficiency

What is Vitamin A? What Does Vitamin A Do?
Vitamin a, sometimes called retinol because it produces pigments in the eye's retina. The eye requires a specific metabolite - retinal - a light-absorbing [url=http://www.1855sacramento.com/woolrich.php]woolrich bologna[/url] substance that is critical for scotopic vision ( low-light vision ). Vitamin An is also significant for strong teeth, skeletal tissue, soft tissue, the skin, and mucous membranes.

Vitamin A comes from two main types of foods :


Retinol - a yellow, [url=http://www.davidhabchy.com]barbour sale[/url] fat-soluble substance. It is [url=http://www.1855sacramento.com/woolrich.php]woolrich outlet[/url] the sort of vitamin An absorbed when eating animal food sources. Sources include cod liver oil, butter, margarine, liver, eggs, cheese and milk.


Carotenes - like alpha-carotene, beta-carotene, gamma-carotene, and xanthophyl beta- cryptoxanthin. Carotene is an orange photosynthetic pigment vital for plant photosynthesis. The orange colours of carrots, sweet potatoes and cantaloupe melons come from its carotene content. Lower carotene concentrations are what give the yellowish coloration to butter and milk-fat. Some omnivores have yellow-colored subcutaneous fat, [url=http://www.achbanker.com/home.php]hollister[/url] such as chickens and humans.
Vitamin A Deficiency


According to Medilexico medical compendium ;
Vitamin [url=http://www.1855sacramento.com/moncler.php]moncler outlet[/url] An is "1. Any 946;-ionone derivative, except provitamin A carotenoids, [url=http://www.thehygienerevolution.com/barbour.php]barbour paris[/url] possessing qualitatively the biologic activity of retinol ; deficiency meddles with the production and resynthesis of rhodopsin, thereby causing night blindness, and produces a keratinizing metaplasia of epithelial cells that may lead to xerophthalmia, keratosis, susceptibleness to contagions, and retarded expansion ;
2. The original vitamin A, now known as retinol.

Vitamin A deficiency is common in poor states and extremely rare in developed states. Sufferers of night blindness - folk who can't see well in soft light - are more likely to have a vitamin A deficiency. Night blindness is one of the commonest signs of vitamin a deficiency. According to WHO ( World Health Organization ), night blindness among expectant women in developing countries is worryingly high.



Vitamin A Deficiency

Pregnant moms with vitamin [url=http://www.vivid-host.com/barbour.htm]barbour uk[/url] A [url=http://www.gotprintsigns.com/monclerpascher/]moncler[/url] deficiency are more likely to die when pregnant and birth, and might have Problems with lactation.

Folk with vitamin A deficiency can also develop xerophthalmia ( dry eyes ) and even complete blindness.

Between 250 thousand and five hundred thousand underfed [url=http://www.vivid-host.com/barbour.htm]www.vivid-host.com/barbour.htm[/url] kids worldwide lose [url=http://www.rtnagel.com/louboutin.php]louboutin pas cher[/url] their visual acuity every year because they don't have enough vitamin A. 1/2 them die inside 12 months of becoming blind.

A kid with not enough vitamin A has a greater risk of dying of some infectious sicknesses, such as measles Low vitamin [url=http://www.sandvikfw.net/shopuk.php]hollister outlet sale[/url] A levels make children more subject to butt rot, slow bone development, and respiration [url=http://www.1855sacramento.com/peuterey.php]peuterey[/url] infections.
.

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