The day before gastroscopy can generally eat rice soup and other easily digestible semi-fluid, fluid food, avoid hot pot and other stimulating food and celery and other coarse fiber food, there is no such thing as the best food. Gastroscopy can directly observe the gastric mucosal lesions, and it is important to keep the stomach clean before the examination to avoid gastric contents covering the mucosal surface and affecting the observation. Usually the day before the examination to eat easy to digest semi-liquid, fluid food, such as rice soup, soybean milk, etc., its water, easy to digest and absorb, the liquid can also clean the gastric mucosa, is conducive to clear observation of the gastric mucosa. You can eat light food such as noodle soup, soft noodles, etc. Avoid hot pot, barbecue and other spicy and stimulating food, so as not to stimulate the gastric mucosa, resulting in gastric mucosa bleeding, etc., which will affect the examination. Celery, sweet potatoes and other foods are rich in dietary fiber, digested food residue, attached to the surface of the gastric mucosa can not fully expose the gastric mucosa, affecting the observation. The day before the gastroscopy diet should be under the guidance of the doctor, according to their own condition reasonable diet, so as not to affect the results of the examination.