Vitamin D Deficiency Risk Factors

If you meet any of these criteria, chances are you're not getting enough D.

By Nancy Kalish
O, The Oprah Magazine | October 20, 2010

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You slather on sunscreen.

If properly applied, SPF 30 will block 97 percent of UV-B rays, which is why some experts feel we should (gasp!) be using less of it. In Australia—the skin cancer capital of the world—the Cancer Council has actually begun recommending a small amount of daily exposure sans protective goop.