Danish researchers assigned obese people with psoriasis to a calorie-restricted diet for 16 weeks, resulting in an average weight loss of 33 pounds and a marked improvement in symptoms. After another 48 weeks on a maintenance diet, they regained about 11 pounds but continued to have a reduction in the severity of psoriasis symptoms.
It has long been observed that psoriasis is associated with obesity and that weight gain tends to worsen the condition. Psoriasis and obesity are both accompanied by low-grade systemic inflammation, and obesity-related pro-inflammatory effects may worsen the severity of psoriasis, the authors suggested.
Also see 18 Keys to Healthy Weight Loss.