No food 8 hours before gastroscopy and no water 6 hours before gastroscopy. Gastroscopy is a medical lens from the mouth down the esophagus deep into the stomach, and shoot real-time scene feedback to the physician, in order to facilitate the physician according to the surface of the stomach to determine the stomach condition, due to the food residues in the stomach will affect the scene under the microscope, hindering the physician’s observation, so generally do gastroscopy before 8 hours do not eat, do gastroscopy before 6 hours do not drink water. Fasting and water abstinence can ensure a clear microscopic view during gastroscopy, and there will be no food residue adhering to the stomach lining to hinder the physician’s observation of the stomach lining. It is important to note that there will be some discomfort during the gastroscopy, so be sure to cooperate with the physician to complete the examination, do not struggle violently, and after the gastroscopy, if there is no other examination or treatment that requires fasting, you can eat.