Percutaneous nephroscope is generally general anesthesia with tracheal intubation. In principle, water should be fasted six to eight hours after operation. But in fact, if you wake up normally after surgery and there is no residual effect of narcotic drugs, you can eat and drink water earlier when you are awake, which will help you recover quickly after surgery. It depends on the nursing regulations of your hospital and operation. There is no special requirement for eating. Of course, just after the operation, you must eat something easy to digest. Generally, just eat some porridge and hot noodle soup. If you insist on eating ribs and elbows, no one will stop you, but you know it's not delicious, right?