ACR 2022 Tweet by Olga Petryna

Even before the introduction of incretin therapy and bariatric surgery, many randomized and interventional studies (2019–2026) have consistently showed that weight loss produces clinically meaningful, dose-dependent improvement in both psoriasis and psoriatic arthritis.

Dietary interventions are rarely taken as seriously as pharmacological therapies in rheumatology. Yet patients ask about them constantly, and an increasing number of studies suggest that nutrition may influence disease outcomes. Two randomized controlled trials presented at EULAR 2026 add to this growing literature in PsA and RA. However, before we start prescribing Mediterranean diets, the data deserve a closer look.

The American Journal of Clinical Nutrition has published the results of the SUN Project study, showing that long-term adherence to a Mediterranean diet (MedDiet) was associated with a substantially lower risk of incident rheumatoid arthritis (RA), but not psoriasis. The study is a prospective…