The day before the gastroenteroscopy, you can eat some easy-to-digest food, such as semi-liquid food (porridge) and fruits. Gastroenteroscopy needs to be performed on an empty stomach to ensure that the examination process is not interfered by food residues that may lead to loss of imaging. The day before the examination, you can eat some semi-liquid food, such as porridge, paste food, digestion and emptying speed are very fast. Fruits are more nutritious, digested quickly, do not cause food residue residue, and have little effect on the imaging of the examination, such as pears, apples, and so on. Fasting should be done within 6h of the gastroenteroscopy and eating as early as possible the night before to help improve the accuracy of the test. In addition to food, it may be necessary to take other excretory drugs, etc., which should be done under the supervision of a physician to avoid adverse events.