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Caucasians who avoid sun exposure more likely to be vitamin D deficient, Stanford study suggests
Date:11/3/2011

the sun had an average level of about 19.7 and sun-loving Caucasians, about 26.4. In contrast, those who frequently stayed in the shade had average levels of 14, 19.2 and 22.8 nanograms per milliliter, respectively.

"This confirms that the issue of vitamin D supplementation is increasingly important." said Linos. She cautioned, however, against wholesale use of dietary supplements before more data has been generated; currently there are two large, randomized clinical trials testing the health effects of relatively high doses of vitamin D.

The real surprise came when Linos found that the reported use of sunscreen did not significantly affect vitamin D levels. Because sunscreens block the ultraviolet rays that trigger the vitamin's production, it seems that regular usage should lower vitamin D in the blood.

"This finding was both interesting and surprising," said Linos. The apparent contradiction is likely due to sunscreen users not using the protection effectively. "People are probably not applying it often or thickly enough," she said. "Often, people use sunscreen when they anticipate getting a lot of sun exposure, unlike others who spend time in the shade in order to avoid the sun."


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Contact: Krista Conger
kristac@stanford.edu
650-725-5371
Stanford University Medical Center
Source:Eurekalert

Page: 1 2 3

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