About the diet after colonoscopy treatment, generally small polyps do not need to fast after treatment, you can give a light diet, liquid or semi-liquid, and after 1 week, you can change to a normal diet. If large polyps after treatment, generally fasting 1-2 days, and then into the liquid or semi-liquid, about 1 week can be changed to the general diet, although the general diet, should be less slag, do not eat too many vegetables and other diets. In addition, while paying attention to the diet, we should always observe the color of the stool, the number of stools, and also pay attention to the presence of severe abdominal pain in order to prevent postoperative complications. Postoperative complications are mainly caused by postoperative bleeding and perforation of the trauma, which patients should pay attention to.