After operation, we should fast for 6 hours, then eat liquid diet 1 day after 6 hours, and then eat slag-free semi-liquid diet for 3 days. After polypectomy, you can eat liquid or semi-liquid diet, and avoid eating coarse grains within 1 week. Generally speaking, it is better to eat alkaline foods: for example, weakly alkaline foods: red beans, radishes, apples, cabbage, onions, tofu and so on.