In winter exposure to sunlight becomes limited, meaning that access to vitamin D is lower. although eating foods such as salmon, eggs and dairy products can be a source of vitamin D, it is not enough. The sun remains the main source of this vitamin needed for the skin and bones. Vitamin D deficiency in adults causes diseases such as osteoporosis, high blood pressure and diabetes.
The most common symptoms of vitamin D deficiency are:
1. Pain in the bones and limbs: According to experts, the difficulty of movement when waking especially in the winter may be due to vitamin D deficiency.
2. Excess weight: increasing of fat ratio in body lead to negative effect on the level of vitamin D in the blood. Because vitamin D is soluble in fat, which means that increasing fat reduces the amount of vitamin.
3. Dark skin: Studies have shown that demographic differences affect vitamin D deficiency. Skin pigmentation acts as a natural sunscreen, and sunscreens reduce the skin's ability to produce vitamin D by 97 percent. This means that dark skin owners have more exposure to sunlight.
4. Head sweating severely: is one of the most common signs of vitamin D deficiency.
5. Gastric Problems: People who suffer from inflammatory bowel syndrome are more likely to suffer from vitamin D deficiency.
and to prevent of vitamin D deficiency , Experts advise that exposure to sunlight and the best time for adequate vitamin D be between 10 am and 3 pm