The next day after overeating, you should have a light diet, drink plenty of warm water, and take gastric mucosal protector medication orally as appropriate. 1. Light diet: the next day after overeating, in order to ensure the normal digestion and absorption of gastrointestinal function, not to increase the burden on the gastrointestinal tract, you should choose light and easy to digest diet, such as thin porridge, noodle soup and so on. 2. Drink more warm water: Drinking more warm water can promote the peristalsis of the gastrointestinal tract, which can help the digestion and metabolism of patients on the second day after overeating. 3. Oral gastric mucosal protector drugs: After overeating, the gastrointestinal mucosa will be damaged to a certain extent, and the next day, oral omeprazole, magnesium aluminum carbonate, etc. can give the gastric mucosa a certain protective effect. However, all of the above medications should be used under the guidance of a doctor to avoid self-medication. If you experience any discomfort the next day after overeating and the symptoms do not get better, you should go to the hospital in time for treatment.