Psoriasis is a long-term skin condition, and diet may help support overall health, but it cannot clean the colon or cure the disease. Eating plenty of fruits, vegetables, whole grains, and foods rich in omega-3s such as salmon, mackerel, and sardines may help reduce inflammation. Drinking enough water and limiting processed or very sugary foods can also support gut health. Consult a doctor for personalised advice along with proper medical treatment.