More proof that the “sunshine vitamin” earns its bright reputation: In a recent British study, endurance athletes with low levels of vitamin D were up to three times more likely to catch a cold. Why? Intense exercise stresses out the immune system. Vitamin D helps reduce the inflammatory response of white blood cells and boost production of microbe-fighting proteins. Another study found that taking calcium and vitamin D pre-workout helps minimize the loss of both minerals. Catch rays for 10 minutes a day to meet the recommended levels of vitamin D, or try a supp.
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