Patients without outflow tract obstruction can eat meat the day before the gastroscopy, but need to make sure that they generally need to fast for more than 6-8 hours before the gastroenteroscopy. The day before the examination, it is best to eat a semi-liquid or low residue diet, such as milk, noodle soup, soy products, etc. Meat can also be eaten, but try not to eat the night before, because the meat itself is greasy and difficult to digest, for the outflow tract obstruction or gastrointestinal tract peristalsis of the patient may cause the digestive tract is not adequately prepared. For the general population, gastroenteroscopy requires fasting for at least 6-8 hours, in addition to stopping iron medication, aspirin and other blood-activating drugs before gastroenteroscopy, and water fasting for more than 4 hours in the morning on the day of the test. Specific precautions should be consulted with the doctor before preparing for the gastroenteroscopy and strictly followed to avoid errors in the test results.