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Article Excerpt
Time for more vitamin D
Missing out on the "sunshine vitamin" has consequences for more than just bone health.
September brings the end of summer in the northern hemisphere and, for many of us, that means less time in the sun. The sun's rays provide ultraviolet B (UVB) energy, and the skin uses it to start making vitamin D. (The skin actually produces a precursor that is converted into the active form of the vitamin by the liver and kidneys.) Vitamin D is best known for its vital role in bone health. Without this "sunshine vitamin," the body can't absorb the calcium it ingests, so it steals calcium from bones, increasing the risk of osteoporosis and fractures. Vitamin D also helps maintain normal blood levels of phosphorus, another bone-building mineral.
Vitamin D would be essential if it did nothing else. But researchers have discovered that it's active in many tissues and cells besides bone and controls an enormous number of genes, including some associated with cancers, autoimmune disease, and infection. Hardly a month goes by without news about the risks of vitamin D deficiency or about a potential role for the vitamin in warding off diseases, including breast cancer, multiple sclerosis, and even schizophrenia. In June 2008, a study published in the Archives of Internal Medicine found that low...
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