It is possible to eat bananas the day after gallstone surgery. It is important to note here that ripe bananas can be laxative, but green bananas are prone to constipation. Unripe bananas contain more tannic acid, which has an astringent effect on the digestive tract and inhibits gastrointestinal motility, leading to constipation. Ripe bananas are rich in potassium, which can promote the recovery of gastrointestinal tract function and improve constipation, so it is beneficial to eat ripe bananas after surgery. The diet after gallstone surgery should be a light diet, avoiding the intake of fried and deep-fried foods, high cholesterol and high protein foods, etc. You can increase the intake of high dietary fiber and increase the intake of vitamin-rich foods, such as fresh vegetables and fruits. After the operation, you should also get out of bed properly, which can promote the recovery of gastrointestinal function and prevent the formation of venous thrombosis of lower limbs and lung infection.