Vitamin D

Vitamin D, prevent the development of rickets, a relatively uncommon in nature. It is contained in a small number of very few of the products of animal origin. These include the liver, egg yolk, fish ROE. The main source of vitamin D is fat extracted from the liver of cod, halibut and other fish. In the liver many fish in the presence of large reserves of vitamin a very little vitamin D. Therefore, for medical purposes using the so-called enriched fish oil, which added certain amount of vitamin D.
Some food products (milk, vegetable oil and others), as well as the yeast contain fat-like substances - sterols that the irradiation of these products ultraviolet rays are converted to vitamin D. From plant products containing so-called ergosterol, formed vitamin D2, and of the products. of animal origin, which are cholesterol, the irradiation - vitamin D3. Ergosterol and cholesterol are, therefore, provitamins D. For human vitamin D3 are more active than (drugs D2.
The formation of vitamin D from cholesterol occurs in the surface layers of the skin of humans and animals under their irradiation with ultraviolet rays of the sun, as well as exposure to artificial UV radiation sources, such as mercury quartz lamp. Adults under normal conditions of operation do not feel the need for additional obtain vitamin D from food. So with the people who by the nature of their activity for a long time are in conditions of artificial lighting or for a long time deprived of the sun, such as miners, residents of the Far North, employees of the metro. These people need to do an incremental get vitamin D. Lack of exposure to ultraviolet rays at the same time without food vitamin D is also one of the main causes of development D deficiency in children.
Vitamin D regulates the exchange of calcium and phosphorus in the body and affects the correct development of the skeleton. Absence or insufficient levels of vitamin D in the diet of children leads to the disease rickets. In rickets, the body loses its ability to absorb calcium and phosphorus food and put them in the bones. The bones of children suffering from rickets, contain much less calcium than in healthy children, and easily change their shape. The edges are soft, chest expands, there curvature of the spine and legs, long overgrown fontanels, delayed teething. These changes skeleton impact on the condition of internal organs. Children suffering from rickets, poorly developed, easily subject colds and other diseases.
Changes in the bones under the influence of lack of vitamin D are observed not only among children but also adults. Such changes, accompanied by a softening of bones, sometimes in women during pregnancy. The lack of vitamin D frequent diseases of the teeth, bad heal bone fractures, slowly formed bone spur. In order to prevent the occurrence of rickets in children, our country is a whole system of measures. Long before the birth of the child, already from the second half of pregnancy, the woman is prescribed vitamin D 500 units daily. During breast-feeding her give 500 units. To increase the content of vitamin D in the body of the mother of it is exposed to ultra-violet rays.
After birth to prevent rickets used air baths, exposure to mercury quartz lamp (especially in the North).
Currently our vitamin industry produces oil and alcohol vitamin D with the indication of number contained in them vitamin in international units. One such unit corresponds to 0,025 micrograms of vitamin D. When breast-feeding your child enough to give daily up to 500 units of vitamin D, and when artificial feeding is not less than 500 units. With the medical purpose, when rickets already appeared, vitamin D impose in much greater quantities.
The preparation of vitamin D are given strictly on doctor's orders, because, like vitamin A, its large doses can cause poisoning.
With the medical purpose vitamin D also nominated for fractures. Recently vitamin D with good results also used in the treatment of tuberculosis of the skin (lupus).