Patients with anal fissures should be cautious with their diet, avoiding spicy and irritating foods to prevent exacerbation. They should also consume foods rich in roughage, such as cornmeal, sweet potatoes, celery, leeks, and cabbage, which can facilitate bowel movements and prevent the aggravation of anal fissures due to dry stools. Additionally, alcohol should be avoided as it may dilate blood vessels and lead to increased bleeding. It is essential for patients with anal fissures to maintain smooth bowel movements and avoid sitting or squatting for extended periods.