The dietary contraindications of psoriasis are as follows: 1. Patients are generally not advised to eat vegetables and fruits such as ginger, toon, leek, hollow cabbage, fern, mango, durian and bamboo shoots; 2. Patients are generally advised not to eat beef, mutton, dog meat, carp, crucian carp, yellow duck call, fish, shrimp and crab; 3. Patients are advised to have a light diet and try not to add spicy condiments and some other spices such as fennel and cinnamon in their daily dishes; 4. Avoid smoking, alcohol and betel nut.