For anal fissure, a high-fibre, well-hydrated diet is important to keep stools soft and reduce straining. Include plenty of vegetables, fruits, whole grains, oats, millets, soaked nuts and seeds such as flaxseed, along with adequate water throughout the day. Avoid constipation-triggering foods, excessive spicy and processed foods, and limit refined flour and fried foods. Regular meals and good bowel habits can support healing and help prevent recurrence.