Hundreds of medical studies now show a significant link between vitamin D deficiency and significantly higher rates of many forms of cancer, as well as osteoporosis, heart disease‚ multiple sclerosis and various other conditions and diseases. Because of these finding, health professionals continue to emphasize the importance of vitamin D sufficiency as one of the most critical preventive factors in human health, along with diet and exercise.Vitamin D lab testing is used to determine if bone weakness, bone malformation or abnormal calcium metabolism (demonstrated by abnormal phosphorus, calcium or PTH tests) is a result of a vitamin D deficiency or sometimes, excess. Because vitamin D is a fat-soluble vitamin and is absorbed from the intestine like a fat, vitamin D tests are sometimes used to monitor the health of individuals with diseases like cystic fibrosis and Crohn’s disease, where fat absorption is interrupted. This monitoring helps to assure the individual continue to absorb sufficient amounts of vitamin D. Additionally, vitamin D lab tests can determine the effectiveness of treatment when individuals are prescribed vitamin D, calcium, phosphorus, and/or magnesium supplements.For a diet rich in vitamin D, consume foods such as egg yolks, fish, and liver, along with milk and cereal fortified with vitamin D.

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