After gastroenteroscopy without treatment, you can eat a small amount of cake, but if you have treatment, it is not recommended to eat cake. Gastroenteroscopy if simply do ordinary colonoscopy, did not take pathology slides, no treatment, etc., after the examination can eat a small amount of cake, if the painless colonoscopy, after the anesthesia effect, conscious after no other discomfort can eat a small amount of cake, but can not eat too much. If gastroenteroscopy treatment, such as gastric polypectomy, intestinal polypectomy, etc., it is not recommended to eat cake, so as not to cause friction and stimulation of the incision, you can eat some liquid food, such as rice soup, milk and so on. After gastroenteroscopy should pay attention to observe the changes in the body, if abdominal pain, blood in the stool and other symptoms should be informed to the physician timely treatment.