Researchers: Higher vitamin D intake can prevent cancer

09/5/2007 | ScientificAmerican.com

People in colder climates should boost their vitamin D levels to prevent cancer, particularly breast and colon cancer, according to a U.S. study. Because sunlight triggers the synthesis of vitamin D in the skin, people who get less sun exposure tend to have lower vitamin D levels. Looking at 15 countries, scientists found that vitamin D levels of at least 22 nanograms per milliliter in the blood induced a protective effect against colon cancer, while a protective effect against breast cancer appeared to begin when blood levels of vitamin D reached 32 nanograms per milliliter.

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