Vitamin D deficiency :
Vitamin D deficiency is the result of an insufficient amount of vitamin D, which is a fat-soluble vitamin, gained by the human body for executing some crucial roles in assisting in calcium absorption, maintaining bone health, and also the functioning of the immune system. The cause for this deficiency may involve inappropriate dietary intake, low exposure to the sun, certain diseases or medical conditions, or problems associated with malabsorption. These deficiencies are very common due to lifestyle habits, such as living in northern latitudes, darker skin, aging, and even some chronic diseases, like celiac disease or kidney disease.Symptoms are generally mild but can comprise muscle aching, bone pain, fatigue, and an increased risk of fractures. In children, so severe a deficiency may lead to rickets with soft and weakened bones, and in adults, osteomalacia or osteoporosis so that the bones become brittle with an increased risk of fractures. New scientific evidence on vitamin D deficiency now indicates associations with susceptibility to infections, autoimmune diseases, and mood disorders.Blood tests which measure serum 25-hydroxyvitamin D levels are a method of diagnosing. Treatment includes a diet change that offers them with vitamin D fortified foods (fatty fishes, fortified dairy products, and egg yolks), supplemented on their own, and exposure to sunlight but limited exposure to the skin to prevent overdosage and trying to achieve some balance of good sun exposure for vitamin D production in the body. Any supplement dosage would probably depend on individual need and medical conditions.