By Rita Rubin, WebMD Health News
The findings come out of the long-running Nurses’ Health Study, which includes only women, but previous research suggests that exercise may also protect men against the chronic skin condition, characterized mostly by inflamed, scaly patches.
As many as 7.5 million Americans have psoriasis, according to the National Psoriasis Foundation, which says it’s the most common autoimmune disease. Men and women are equally affected. Previous research has linked higher body mass index, or BMI, family history of psoriasis, alcohol use, and smoking to the risk of psoriasis.