In another example of the influence of UV exposure independent of vitamin D, a recent study shows a preventative association between sun exposure and allergic diseases eczema and rhinitis.

Australian researchers used cohort data from 1,433 infants originally examined in 1988-89 to compare allergic disease (asthma, eczema, and rhinitis) and allergen sensitization to vitamin D levels and reported sun exposure, according to the Vitamin D Council. They found that “higher sun exposure during summer holidays and weekends in adolescence was associated with significantly reduced risk of eczema and rye grass positive rhinitis,” and winter sun exposure also was protective against eczema. Vitamin D levels did not correlate with a reduction in these conditions.

The beneficial effect of UV radiation on atopic dermatitis has been previously documented and could explain the observed reduction in eczema risk, but does not explain the association with allergic rhinitis.

“The beneficial effects of sun exposure on allergic disease may operate independently from vitamin D or an effect on allergen sensitization,” the researchers concluded. They encourage further research on the subject.

Click here to read the overview of the study.

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