The day before a gastroenteroscopy it is generally recommended to eat easily digestible, non-digestible food. On the day before the gastroenteroscopy, it is not allowed to eat as usual because there is a restriction on eating because bowel preparation is needed before doing the examination, i.e., the gastrointestinal tract needs to be emptied so that the surface of the gastrointestinal tract can be clearly seen for accurate examination results. In the day before the examination, try to reduce eating, you can eat some easy to digest food, such as millet porridge, etc., because to the examination the day before the evening after six o’clock is not recommended to eat, then you need to start to take laxatives such as polyethylene glycol electrolyte bulk, etc. to empty the intestinal tract, eat some easy to digest food can shorten the time of intestinal preparation, but also can make the intestinal preparation easier. Therefore, it is better to eat less or eat easily digestible food the day before the gastroenteroscopy.