Vitamin D Deficiency
DefinitionVitamin D is a fat-soluble vitamin. Fat-soluble vitamins are stored in the body's liver and fatty tissues. Vitamin D acts as both a vitamin and a hormone. Two of the main sources of vitamin D are food and sunlight. The ultraviolet rays of the sun react with cholesterol present on the skin and create previtamin D3. This compound goes through a series of reactions involving the kidneys and the liver. The final product is vitamin D. Vitamin D deficiency describes low levels of vitamin D in the blood. This condition can lead to a condition known as rickets in children. In adults, it can lead to osteomalacia . These are two forms of bone diseases that weaken bones. It is important to contact your doctor if you think you have vitamin D deficiency.
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CausesVitamin D deficiency can be caused by:
- Inadequate intake of vitamin D in the diet
- Lack of sunlight due to:
- Having a darker skin color
- Wearing clothes that cover most of the skin
- Living in northern latitudes during the winter
- Not being exposed to direct sunlight—Sunlight through windows, clothes, or sunscreen-covered skin is not enough for the body to synthesize vitamin D.
- Conditions and procedures that affect the body’s ability to absorb vitamin D from the digestive tract (such as celiac disease , inflammatory bowel disease , bariatric surgery)
- Conditions or medications that affect the process of converting vitamin D to a form that the body can use, such as:
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