Vitamins of group D (calciferols) is a common name of fat-soluble vitamins, which includes several active forms.
Calciferols saturate the body with phosphorus and calcium, participate in the regulation of the functions of the parathyroid and thyroid glands, adrenal glands, pituitary, increase the degree of absorption in the intestine and phosphorus reabsorption in the renal tubules. Vitamin d is calcification of the bones for proper formation skeleton's.
Vitamin D is also called "solar vitamin" because it is synthesized in the human body as a result of exposure to a quartz lamp and under the influence of UV rays.
Vitamin Production stops after the skin is covered with a tan, and does not resume until the tan is "gone".
An Adult needs to consume 100 IU of the substance per day, pregnant and lactating women – 500 IU.
Vitamin D for the newborn is fed with mother's milk.
Vitamin d functions:
- prevents premature aging of the skin and the body;
- serves as prevention of rickets in children, periodontal disease and osteoporosis;
- important for the proper development and growth of children;
- control of calcium-phosphorus metabolism;
- provides strength of teeth and bones.
What are the vitamins D?
There are two active forms of vitamin D: D2, D3.
Vitamin D2 (ergocalciferol) is a plant-derived vitamin;
Vitamin D3 (cholecalciferol) is a vitamin of animal origin that is most acceptable to humans. It is in this form that vitamin D for newborns comes from mother's milk, and is subsequently formed in the skin of cholesterol under the influence of solar radiation.
Calciferol is considered a powerful immune system stimulant – it increases the body's ability to resist infections and viruses. Also it is in the list of drugs for the treatment of multiple sclerosis, psoriasis, cancer.
Lack of vitamin D in the human body
Lack of calciferols occurs due to insufficient ultraviolet radiation, malabsorption in the intestine and reduce the amount of vitamin in the daily diet.
Vitamin Deficiency in children leads to the development of rickets. Children with vitamin D deficiency are prone to infectious diseases, they lag behind in physical development and suffer from low hemoglobin. There are curvature of the skull, chest, limbs. Teeth erupt with a delay.
Beriberi in adults provokes destruction teeth and the development of osteoporosis.
In large cities and industries there is a constant smoke of the air, which reduces the synthesis of calciferol. It also reduces the amount of substance produced by intense sunburn, as dark skin has the ability to repel UV-rays, and in fact they play a key role in the construction of vitamin D. In the elderly, due to reduced activity of processes, and decreases the rate of formation of calciferols, because of what they have osteoporosis develops.
Ointment with vitamin D is also an excellent remedy in the fight against psoriasis.
Excess vitamin D in the human body
The Increased content of vitamin D in the body is reflected in the deposition of calcium salts in the internal organs, hypercholesterolemia, premature calcification of bones.
What foods contain vitamin D?
Under the influence of sunlight in summer, the skin is formed enough vitamin d – enough 15-minute exposure to the sun in the morning and at sunset.
Remember that although ultraviolet rays are a key factor in the formation of calciferols, their abuse can lead to chronic skin diseases.
Vitamin D is found in the following products: fish oil, egg yolks, milk fat. A lot of calciferols in the liver of cod, sea burbot, flounder, halibut, caviar, mushrooms, yeast, dairy products.
In Order for vitamin D to be properly absorbed in the intestine, it is necessary to consume a normative amount of fat.