Vitamin D is the vitamin known as the sun's vitamin. The main source of exposure is the body's exposure to the sun until the body produces this vitamin, by exposing the skin to ultraviolet light from the sun, it converts the cholesterol in the skin through a series of biological processes to Vitamin D. The exposure of the hands and feet to the sun from five to ten minutes, two to three times a week long enough to provide the body need of vitamin D, in addition to the availability of limited quantities in some foods. [1]
Vitamin D and calcium Vitamin D increases the level of calcium in the blood by: [1] increasing the absorption of calcium from the intestines. Reduce calcium loss by urine by increasing calcium re-absorption in the kidneys. The lack of calcium in the blood stimulates the secretion of thyroid glands in the blood, which increases the level of calcium in the blood by analyzing calcium from the bones. When calcium levels increase in the blood, the calcitonin hormone (Calcitonin) The thyroid gland reduces the amount of calcium in the blood by increasing its calcification in the bones.
The importance of vitamin D vitamin D, which is metabolized in the body is called 1.25 - dihydroxy coliccivalol (English: 1,25 (OH (2D3)), where vitamin D enters many of the biological processes, including: [2] maintain the growth and development of bones and teeth Healthy. Maintain a balance of calcium and phosphorus metal in the body. Inhibition of cancer cell growth. Protect the body from various immune diseases. Minimize the incidence of inflammation in the body. (1) Vitamin D's dietary requirements Recommended vitamin D supplements are enough to maintain bone health, teeth, and calcium metabolism in healthy people. The quantity varies according to the age of the person as follows: [3] Babies aged 0-12 months need 400 IU. Children aged 1 to 60 need 600 IUs
Sources of vitamin D There are very few foods that contain the natural nature of vitamin D, the flesh of fatty fish (such as salmon, tuna, mackerel), and fish liver oils of the best sources, and there are low amounts of vitamin D in ( Liver, cheese, egg yolk). Vitamin D can be obtained from fortified foods such as milk, butter and orange juice. Vitamin D can be obtained from supplements, but should not be taken without consulting your doctor. As for exposure to sunlight, most people get a small amount of their needs of vitamin D through exposure to sunlight, for several reasons, including: [1] clothing; clothing can cover a large part of the body when exposed to direct sunlight. Use sunscreen. Vitamin D deficiency Vitamin D deficiency is rickets in children, osteomalacia in adults, and may lead to osteoporosis and fractures. Vitamin D deficiency is associated with a high incidence of cancer, Autoimmune diseases, Hypertension, and infectious diseases. Vitamin D deficiency is widespread throughout the world regardless of age, health status, and vitamin D deficiency is associated with a lack of calcium absorption and metabolism. [3] Vitamin D deficiency and risk of cancer: Low vitamin D levels in the body Is closely linked to the risk of cancer and death rate, because vitamin D is many processes that may slow or prevent cancer, and these include: [4] [5] [6] Reduce the growth of cancer cells. Stimulate the process of apoptosis, a natural process that occurs for the cells of the body to maintain the integrity of the body and the vital processes that occur within it. To promote the cellular differentiation of cells within the body, a process of differentiation of cells into different types of specialized cells. Reduce the occurrence of angiogenesis of cancer cells, the process by which cancer cells begin to spread, through the production of food and energy for cancer cells through blood vessels.