This review combined data from several studies on adults with psoriasis. It looked at how weight-loss interventions compared to usual care or lower-intensity programs. The main measure was the Psoriasis Area and Severity Index, or PASI.
The analysis included 1,145 people. It found that weight-loss interventions produced a greater reduction in PASI scores. They also increased the likelihood of achieving a 75% improvement in PASI. However, they did not significantly affect the likelihood of a 50% or 100% improvement.
The review also found a significant improvement in quality of life scores. Safety concerns were not reported in the included studies. A key reason to be careful is that analyses for some outcomes were limited by few studies.
The main takeaway is that weight-loss interventions may help improve psoriasis severity and quality of life. This is high-certainty evidence, but it does not prove cause and effect. Readers should see this as a potential part of a broader treatment plan.