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  • Title: Vitamin D: a d-lightful solution for health.
    Author: Holick MF.
    Journal: J Investig Med; 2011 Aug; 59(6):872-80. PubMed ID: 21415774.
    Abstract:
    Throughout evolution, sunlight-produced vitamin D in the skin has been critically important for health. Vitamin D, known as the sunshine vitamin, is actually a hormone. Once it is produced in the skin or ingested from the diet, it is converted sequentially in the liver and kidneys to its biologically active form 1,25-dihydroxyvitamin D. This hormone interacts with its receptor in the small intestine to increase the efficiency of intestinal calcium and phosphate absorption for the maintenance of the skeleton throughout life. Vitamin D deficiency during the first few years of life results in a flattened pelvis, making it difficult for childbirth. Vitamin D deficiency causes osteopenia and osteoporosis, increasing risk of fracture. Essentially, every tissue and cell in the body has a vitamin D receptor. Therefore, vitamin D deficiency has been linked to increased risk for preeclampsia, requiring a cesarean section for birthing, multiple sclerosis, rheumatoid arthritis, types I and II diabetes, heart disease, dementia, deadly cancers, and infectious diseases. Therefore, sensible sun exposure along with vitamin D supplementation of at least 2000 IU/d for adults and 1000 IU/d for children is essential to maximize their health.
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