It’s best to eat a mainly non-dregs liquid diet the day before the colonoscopy. This is because the cleanliness of the intestines affects the results, and the cleaner the intestines are, the more accurate the results will be. The day before the colonoscopy to a light diet, you can eat some fluid, semi-fluid food, preferably to the main non-dregs of the liquid, you can drink rice porridge, noodle soup, as well as pimple soup, soft noodles, hairy buns, etc., it is best not to eat greasy, rich in fiber, not well digested food, such as cabbage, celery, leeks, and apples with the skin and so on. The day before the colonoscopy after eating dinner is not recommended to eat again, and need to take polyethylene glycol electrolyte bulk and other laxatives to do intestinal preparation, until the intestinal feces completely clean, conducive to the process of examination to carefully observe the intestinal mucosal lesions. Of course, before the specific colonoscopy need to do what preparation, it is recommended to consult a professional physician, so as not to affect the results of the colonoscopy.