What you can eat before having rectal polyp surgery is based on the time period before surgery. Fluid food for 2 to 3 days before surgery and fasting for 8 to 12 hours before surgery are explained below. 1. 2 to 3 days before the operation into liquid food: in order to keep the intestinal tract clean during the operation, to avoid causing anastomotic infection, 2 to 3 days before the operation to start eating more easily digestible liquid food, such as millet porridge, batter, egg custard, milk and other non-slagging diet. 2. Fasting 8 to 12 hours before surgery: In order to prevent choking or aspiration pneumonia caused by anesthesia or intraoperative vomiting, fasting should be started 8 to 12 hours before surgery, and no drinking should be started 4 hours before surgery. When performing intestinal surgery, you should strictly follow the diet prescribed by the doctor so as not to affect the progress of the surgery, and if you feel uncomfortable, please communicate with your doctor in time.