Definition of Vitamin A
Retinol or better known by the name of vitamin A, a vitamin that is essential for maintaining the health of the eye or the sense of sight at night. Vitamin A deficiency can lead to diseases such as cataracts sense of sight, night blindness, and more.Vitamin A is a vitamin that is soluble in fat which is then saved in the liver. Vitamin A can fight cancer, which is vitamin C. Vitamin A consists of two forms: pre-formed vitamin A and pro-vitamin A. Vitamin A pre-form is divided into 4, among others: retinol, retinyl esters, retinal, and retinoic acid. While the pro-vitamin A is beta-carotene. That is the definition of vitamin A.
Benefits of Vitamin A
Venefits of vitamin A needed in the formation of pigment in the eye that are useful for vision, especially at night and on the lighting conditions are less. Benefits of vitamin A than beneficial as maintaining healthy vision, the benefits of vitamin A can also help to keep healthy bones, nourishes the skin, teeth, and mucous membranes of the nose maintain. In addition, the benefits of vitamin A is also necessary for the development of the fetus in the uterus properly.
Sources of Vitamin A
Sources of vitamin A are often found in the form of beta-carotene as well esters of vitamin A and vitamin A-free. Definition of beta-carotene, according to wikipedia: beta-Carotene.
Vegetable sources of vitamin A
Vegetable sources of vitamin A include: apple, lily, amaranth, breadfruit, red amaranth, velvetleaf leaves, seaweed, leaves of guava, cashew leaves, leaf beans, eggplant, wheat, beans, peas, red beans, mango, kale, chinese cabbage, parsnip yellow, red sweet potato, red yams, pumpkin, banana, papaya, cabbage, clover, and carrots.Animal sources of vitamin A
Animal sources of vitamin A include: liver, milk, eggs, various types of fish (sardines, tuna, clams, cork, rabbitfish, lehoma, crabs, coral trout)Deficiency and excess vitamin A
Surely deficiency or excess is not good. Vitamin A deficiency can lead to diseases such as cataracts, night blindness, respiratory tract infections, and decreased endurance. While an excess of vitamin A can cause hair loss, dry scaly skin, poisoning, fainting, and dizziness.That article about definiton, benefits, and sources of vitamin A. Also read the article about what is protein and the benefits of vitamin E.
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