Patients with Crohn’s disease should not eat unhygienic food, cold, greasy, spicy and irritating food. 1. Unhygienic food: for example, food contaminated by pathogens, rotten and spoiled food, overnight food, expired food, etc. Eating these foods can easily cause pathogen infection and aggravate Crohn’s disease easily. 2. Cold, greasy, spicy and irritating food: for example, onion, garlic, spicy hot, fat meat, ice-cream, ice-cold beer, chili pepper, tobacco and alcohol, etc. Eating these foods is likely to aggravate the symptoms of Crohn’s disease. If the condition of Crohn’s disease is aggravated by improper diet, it is necessary to actively seek medical attention, and patients should not self-medicate, but should be treated under the guidance of physicians.