Increasing number of Americans have insufficient levels of vitamin D

Average blood levels of vitamin D appear to have decreased in the United States between 1994 and 2004, according to a report in the March 23 issue of Archives of Internal Medicine.

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<p><a href="http://www.physorg.com/news157050961.html">Increasing number of Americans have insufficient levels of vitamin D</a></p> <p>Average blood levels of vitamin D appear to have decreased in the United States between 1994 and 2004, according to a report in the March 23 issue of <i>Archives of Internal Medicine</i>.</p>