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Vitamin D & Colds

Nutrition Action Health Letter

04-03-09

Originally Published:20090401.

People with low blood levels of vitamin D have a higher risk of colds and other upper respiratory infections, especially if they also have asthma or chronic obstructive pulmonary disease.

In a study of nearly 19,000 people in the National Health and Nutrition Examination Survey, the risk of an upper respiratory infection was 36 percent higher in those with low vitamin D levels (less than 10 ng/mL) than in those with normal levels (at least 30 ng/mL). The risk was 24 percent higher in those with intermediate levels (10 to 29 ng/mL).

What to do: While the study needs confirmation, it's worth taking 1,000 IU a day of vitamin D to keep bones strong and possibly cut the risk of cancer, diabetes, and falls.

Arch. Intern. Med. 169: 384, 2009.

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