Vitamin A. It is a vitamin of growth, is present in all kinds of greens and in all fats of animal origin, with the exception of lard. In vegetable oils from seeds (for example, in cotton oil Wesson) this vitamin too is almost absent.

Retinol is involved in the biosynthesis of glucoproteins that make up the mucous membranes and other barrier tissues, so it is necessary for the normal function of the mucous membranes of the eyes, respiratory, digestive systems and urinary tract. The aldehyde form of vitamin A is part of the visual purple, providing the adaptation of the eyes to different illumination of the environment.

When there is little vitamin A in the food, then in the body there is not enough physical development, there is no vitality, normal growth. The muscles are easily tired, the skin is unclean, acne on the face, chiri on the body, in the ears is a large deposition of sulfur. And most importantly, there is dryness and inflammation of the cornea of ??the eye until the disease "night blindness". Dry mucous membrane appears not only in the eyes, but in the nose, throat, lungs, intestines, urinary canals, which deprives them of protection from infection.

Vitamin A is especially important for children, because when it is deficient, children easily suffer from all sorts of diseases. If a small child begins to intensively feed vitamin A, then he grows rapidly.

Vitamin A. This vitamin is often considered only as a "child" vitamin. Indeed, vitamin A is absolutely necessary for the normal growth and development of the child. In adults, however, a lack of vitamin A leads to a disruption of twilight vision, the occurrence of "night blindness". This is a state where a person in the twilight can not clearly see the objects. Vitamin A affects the condition and protective properties of the skin and mucous membranes of the respiratory, digestive and genitourinary systems, as well as the glands of the stomach and intestines. The need for vitamin A is 1.5-2.5 mg per day, it can satisfy B-carotene, which is converted into retinol in the wall of the small intestine and liver. The need for vitamin A increases with work associated with the strain of the organ of vision (drivers of all types of transport, jewelers and t. ) or with chemical substances, dust, irritating the mucous membrane of the eyes, upper respiratory tract, skin.

The main sources of vitamin A are animal products: fish oil (cod liver oil), liver, eggs, cow oil, cream, sour cream. However, to fully satisfy the body's need for vitamin A at the expense of. these products is difficult. Usually, with an average mixed diet with food, 0.5-0.7 mg of vitamin A, t. daily requirement is provided. The rest of the need is covered by a special substance - carotene, which in the body turns into vitamin A. By its vitamin activity, carotene is 3 times weaker than vitamin A, and therefore carotene is required 3 times more than vitamin A. According to modern scientific data, it is considered normal if, at least у3, the vitamin A requirements are met by the vitamin itself, and the remaining 2/3 by carotene. Contained carotene in plant products, painted in green or orange-red color: with green onions, parsley, carrots, dogrose, red pepper. Very much it or him in a neetle.

The present natural concentrate of carotene is palm oil, in which the amount of carotene reaches 80 mg, and the oil from sea-buckthorn, in which carotene to 40 mg. The best use of carotene from boiled or from crude finely grated carrots is noted.

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