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Much of the American population (including a majority of pregnant women) are deficient in vitamin D. Odds are good that you are too.

A big contributing factor is insufficient exposure to sunlight. Some have speculated that seasonal winter flu season is attributable to vitamin D levels.

http://www.usatoday.com/news/health/2008-07-13-vitamin-d-tes...




In the UK we get sun only during May or April. So accordingly we should hardly have vitamin D!




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