It is prohibited to eat or drink 6 hours before the operation of painless abortion, which means no eating or drinking. After eating there is food in the stomach, in the case of anesthesia, because the patient is sleeping, during the surgical operation, due to the surgical stimulation there is a possibility of nausea, vomiting or cause food reflux, choking and coughing, food blocking the trachea easily cause asphyxiation, very dangerous, even life-threatening. Therefore, you must not eat before the operation, and make sure that there is no food in the stomach, and it is safer to perform the operation with the stomach in an empty state. After the surgery, the patient gradually wakes up and needs to be prohibited from eating and drinking for 4 hours after the surgery. After the anesthetic drugs are completely metabolized and the patient is fully awake, he can eat semi-liquid food, such as porridge, chicken cake and other easily digestible food, and resume normal diet after 24 hours.