Fish soup can be consumed after gastroenteroscopy, but the time when it can be consumed should be analyzed according to the specific situation, following the doctor’s instructions. Simply after gastroscopy without observing obvious lesions of the organism is allowed to eat 1 to 2 hours after the end of the operation, the corresponding colonoscopy can be eaten right after the operation, and the consumption of things can not be limited. If biopsies and simple treatments (e.g., forceps removal of small polyps) are performed during gastroenteroscopy, it is necessary to eat 1 to 2 hours after the end of the operation, but avoid eating food that is too hot. If gastroenteroscopic treatment is performed, such as resection of polyps of excessive diameter, endoscopic mucosal resection of early cancerous lesions, etc., it is necessary to gradually transition to a postoperative diet, and it usually takes 5 to 7 days to transition to normal fish soup.