A team of pediatricians noticed that many of their young black and Hispanic patients were deficient in vitamin D. A hefty weekly dose of of the vitamin for two months was needed to get most of the teens' blood levels to the concentration that endocrinologists advise. Noel Hendrickson/Ocean/Corbis hide caption

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Disease susceptibility varies among ethnic groups, but medicine hasn't always recognized that. Jo Unruh/iStockphoto hide caption

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Katherine Streeter for NPR

If only it was as simple as popping a supplement and being set for life. But alas, no. iStockphoto.com hide caption

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Spring has brought the stork and a baby who just might have a higher risk for multiple sclerosis later in life. Anna Bryukhanova/iStockphoto.com hide caption

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Reducing dietary salt and alcohol, exercising, not smoking and maintaining a healthy weight are other lifestyle tweaks known to help prevent or reduce high blood pressure, doctors say. David McNew/Getty Images hide caption

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A woman pours two tablets into her hand from a pill bottle. iStockphoto.com hide caption

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