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Funding sources: This work was supported by the Department of Dermatology, Warren Alpert Medical School of Brown University, National Institutes of Health grant UM1 CA176726, and the National Psoriasis Foundation.

Conflicts of interest: none declared.

Dear Editor, Fish are rich in marine omega‐3 fatty acids (FA) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). As marine omega‐3 FAs have anti‐inflammatory and immunomodulatory properties, their potential use as a dietary adjunct in the treatment of psoriasis has been explored.1,2,3 Fish‐oil supplements have shown potentially protective effects on progression of psoriasis in small‐scale (n = 9–145) clinical studies.2,3,4 However, fish oil's benefit for psoriasis has been difficult to confirm because of the lack of baseline measures of dietary and nutritional status.5 To our knowledge, no prospective data are available on the association between dietary intake of omega‐3 FAs and risk of psoriasis and psoriatic arthritis (PsA).6 Therefore, we examined the association between consumption of polyunsaturated FAs and risk of incident psoriasis in the Nurses’ Health Study II (NHS II).

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