For some UK teens, sun doesn't provide enough vitamin D

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At one point in the year, almost 80 percent of teens in a UK study had insufficient vitamin D that should come from sun exposure, and one quarter had insufficient levels even at the peak of summer, according to a new study.

The results were surprising because the participants were white children, whose skin is the most sensitive to ultraviolet-B and who therefore need the least amount of sunlight exposure to get enough vitamin D, said senior author Lesley E. Rhodes of the University of Manchester in the U.K.