Monday, December 6, 2010

Vitamin A


Vitamin A is fat-soluble vitamins are first found. Broadly, vitamin A is a generic name that states all the retinoids and the precursors / provitamin / carotenoids that have biological activity as retinol.
Vitamin A contained in animal food, while carotene mainly in vegetable food. Sources of vitamin A are liver, egg yolks, milk, and butter. While the source of carotene are dark green vegetables as well as vegetables and fruits, yellow-orange, such as cassava leaves, bean leaves, kale, spinach, long beans, green beans, carrots, tomatoes, corn, papaya, mango, jackfruit, and orange .
The first signs of vitamin A deficiency is night blindness. Vitamin A deficiency also causes loss of appetite. This may be due to keratinization tuft-flakes taste on the tongue. Vitamin A also plays a role in the formation of red blood cells, possibly through interaction with iron.
Excess vitamin A can only happen if consuming vitamin A as supplements in high doses over long periods. Symptoms in adults, such as headache, dizziness, nausea, hair loss, dry skin, anorexia, and pain in the bones. In women periods will stop. Hydrocephalus occurs in infants.

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