1. Sources of vitamin D
2. action of vitamin D
3. need for vitamin D
4. Symptoms of hypovitaminosis
5. Symptoms of hypervitaminosis
Vitamin D (ergocalciferol) refers to a group of fat-soluble vitamins.This material is formed from sterols by exposure to ultraviolet rays.Development of vitamin occurs in animal and plant tissues.It can be dissolved in organic compounds and fats, but is not able to dissolve in water.
In humans, the substance is produced from pro-vitamins that come from certain products in the finished form, or formed from cholesterol under influence of ultraviolet rays.
products in which vitamin D is found in
Among these foods can be identified egg yolk, dairy products, cod liver oil.It should be noted that the food sources will not be able to fully cover the deficit in the body material.
Among the products in which the vitamin D is found in sufficient quantities, can also be isolated herring, beef liver and butter.
Vitamin D contributes to the full absorption of calcium, phosphorus and magnesium - nutrients necessary for normal development of the skeletal system.Thus, vitamin provides calcium deposition in the dentin, prevents the development of rickets and osteoporosis, prevents osteomalacia, ie osteomalacia.
In addition, vitamin enhances immunity, normal blood clotting and healthy functioning of the thyroid gland, and also prevents muscle weakness.
This substance is directly involved in the restoration of the protective sheaths that surround nerves.Widely used vitamin in the complex therapy and prevention of multiple sclerosis.It normalizes the heart rate and blood pressure, preventing the growth of cancer cells.
The main source of Vitamin D - it is definitely the sun.Therefore, to completely cover the body's need for this material is sufficient for 15-20 minutes per day to be exposed to ultraviolet rays, preferably in the morning.However, such factors as the pronounced tan, winter, smoke atmosphere, as well as old age may adversely affect the body's ability to produce the substance.The use of products in which the vitamin D is found in insufficient to maintain the required level, as well as the neglect of food rich in this substance may adversely affect the development of his body.
need for vitamin D for infants may be from 500 to 1400 IU per day depending on the weight of the baby's body.The need for vitamin D for children from five to twelve years is 400-500 IU per day.For pregnant and lactating women, the recommended dose is 600-800 IU per day, and for people in old age - 600-800 IU per day.
insufficient production in the body of the substance can lead to the development of bone diseases such as rickets, osteomalacia and.
milder forms of vitamin deficiency can manifest itself in the form of a burning sensation in the mouth and throat, worsening of appetite and vision, weight loss and insomnia.
Vitamin deficiency (lack of vitamin D) is shown in the form of osteomyelitis, osteoporosis, osteomalacia, hypophosphatemia, bone fractures, hypocalcemia, hypoparathyroidism, lupus, chronic enteritis and gastritis, tuberculosis, pancreatitis, as well as enterocolitis complicated by osteoporosis.
Applying too high doses of vitamin A can lead to the development of muscle, headache and joint pain.When hypervitaminosis marked increase in blood pressure, vomiting, nausea, weakness, fever, disturbance of stool, increased heart rate and shortness of breath.
Chronic overdose of the substance can cause osteoporosis, resorption stroma, bone demineralization, as well as violations of the kidneys, intestines and lungs.
dose of vitamin D for infants must be strictly controlled, without exceeding the permissible level.The same applies to the dose of vitamin D for children at an early age.
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