The causes of psoriasis are complex, and part of the reason is that patients are usually negligent in caring for their condition, which causes it to recur and become severe, especially in terms of diet. Psoriasis patients must abstain from eating, limiting fried, greasy, salt-pickled food; avoid spicy and allergic foods, especially during the progressive period, so as not to cause homotypic reactions; alcohol plays a potentially negative role in psoriasis patients and should be avoided, as alcohol dilates blood vessels, causing increased vascular permeability, facilitating neutrophil excursions, infiltrating into the epidermis and triggering the disease; and affecting the course and state of the disease It also affects the disease process and status. Patients with psoriasis should have a reasonable diet and pay attention to balanced nutrition; a low-calorie diet can improve psoriasis; vitamin B12 and selenium have auxiliary therapeutic effects; in addition, it is necessary to take in more abundant proteins; psoriasis patients lose a large amount of protein due to the shedding of a large number of scales, which will cause hypoproteinemia in a timely manner and lead to serious illness and various complications. The good quality and cheap soy products and fresh dairy products are available for patients to choose. Fruits and vegetables are also an indispensable part of the diet to increase fiber intake and reduce constipation, such as pears, grapefruit, grapes, sugar cane, oranges, etc. At the same time, attention should be paid to increase water intake, about 1.6L of clean water per day.