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 live north of 34 degrees latitude.

"From October through March, the angle of the sun is so low that we just can't produce any D from it," says Joan M. Lappe, PhD, a researcher and professor at Creighton University. Only those living south of 34 degrees (imagine a line running from Los Angeles to Columbia, South Carolina) get enough UV-B rays year-round.