What foods should people with psoriasis avoid?

Individuals with psoriasis—a chronic, immune-mediated inflammatory skin condition—do not have universally mandated dietary restrictions, but evidence suggests that certain dietary patterns and specific foods may influence disease activity and overall health. While no single “psoriasis diet” is scientifically proven to cure or eliminate the condition, clinical observations and emerging research indicate that avoiding or limiting certain foods may help reduce systemic inflammation and potentially improve symptom control.

Patients are generally advised to limit or avoid highly processed foods, refined carbohydrates (e.g., white bread, pastries, sugary cereals), and added sugars, as these can promote insulin resistance and low-grade systemic inflammation—both of which may exacerbate psoriatic inflammation. Excessive alcohol consumption is strongly discouraged, particularly in those with plaque psoriasis or psoriatic arthritis, as alcohol can trigger flares, interfere with treatment efficacy (especially methotrexate), and increase liver toxicity risk.

Some individuals report sensitivity to gluten-containing foods; although celiac disease is more prevalent among people with psoriasis than in the general population, routine gluten avoidance is not recommended unless serologic testing confirms celiac disease or non-celiac gluten sensitivity. Similarly, while nightshade vegetables (e.g., tomatoes, peppers, eggplant) are sometimes cited anecdotally as triggers, robust clinical evidence supporting widespread elimination is lacking—dietary exclusions should be individualized and guided by symptom tracking rather than blanket recommendations.

A balanced, anti-inflammatory dietary pattern—rich in omega-3 fatty acids (found in fatty fish, flaxseeds, walnuts), colorful fruits and vegetables, whole grains, lean proteins, and healthy fats—is consistently associated with better long-term outcomes. Maintaining a healthy weight is also clinically important: obesity is both a risk factor for developing psoriasis and a contributor to increased disease severity and reduced treatment response. Therefore, nutritional counseling and personalized lifestyle support—ideally delivered by a dermatologist in collaboration with a registered dietitian—are valuable components of comprehensive psoriasis management.