There is no such thing as the best food after anal fistula surgery, you can consume coarse grains and high protein foods, such as wheat, oat bran, black beans, eggs, milk and so on. 1. Roughage food: such as wheat, oat bran, whole grain food, not only to ensure that the intestinal tract has enough water and crude fiber to stimulate the intestinal wall to cause defecation reflexes, but also to maintain a smooth bowel movement. 2. High protein foods: such as black beans, milk, lean meat, eggs, etc. Protein can be broken down into amino acids, mainly used to re-synthesize the components of the cell, which can promote wound healing, but also to supplement the zinc, potassium and other trace elements, zinc in the promotion of protein synthesis plays an important role in the process. In order to prevent improper diet from affecting the recovery of postoperative patients, you should avoid eating fatty meat, animal offal, lard, etc., and abstain from smoking and alcohol. Patients are advised to follow the doctor’s instructions and not to be negligent, so as not to affect the postoperative recovery.