One-third of Americans are lacking vitamin D
April 2, 2011
About one-third of Americans are not getting enough vitamin D, a government report says.
The report, out Wednesday from the Centers for Disease Control and Prevention, parallels what many other studies have suggested in recent years: that a large chunk of the population is at risk for low vitamin D levels.
About two-thirds had sufficient levels, but about a third were in ranges suggesting risk of either inadequate or deficient levels, says report author Anne Looker, a research scientist with the CDC.
Late last year, the Institute of Medicine recommended new daily intakes for calcium and vitamin D when it comes to bone health. They also defined four categories based on results from a common vitamin D blood test, called a serum 25-hydroxyvitamin D, or 25OHD. Looker applied the institute's four categories (vitamin D sufficiency, risk of deficiency, risk of inadequacy and levels that are possibly too high) to data from the National Health and Nutrition Examination Survey to get the figures.
Sufficient levels are 20 to 50 nanograms per milliliter. Inadequate (unhealthy) levels are 12 to 19 ng/ml. Below 12 ng/ml flags a deficiency; bones are at risk for disease.
The results aren't surprising, says vitamin D researcher Marian Evatt, assistant professor of neurology at the VA Medical Center and Emory University in Atlanta.

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Posted by Ken at 12:00 AM