You can eat fish the day before a gastroenteroscopy, but you should eat a light diet.
Gastroenteroscopy can play a role in diagnosing diseases and treating gastrointestinal diseases. Patients need to maintain a light diet the day before the gastroenteroscopy, and can eat some millet porridge, lean meat porridge, milk, bread, steamed fish, etc., so the day before the gastroenteroscopy can eat fish.
In addition, you need to fast for eight hours before performing gastroenteroscopy, and you need to use laxatives such as polyethylene glycol electrolyte bulk to empty the intestines before performing gastroenteroscopy, which will help the doctor observe the gastrointestinal tract more directly and conveniently.
Patients who need to do gastroenteroscopy are recommended to do so under the guidance of a doctor.