Before the surgery, the anesthesiologist at least the day before to see the next day’s surgery patients, especially the parents of small children will ask the children have the habit of eating in the middle of the night, or in the morning very hungry situation can eat, or can eat less food, the anesthesiologist can tell you clearly, this is completely not allowed, more, less is not allowed. Because in the absence of anesthesia, human beings have normal coughing and swallowing functions, but in the state of anesthesia, these functions are weakened or even lost. Anesthesia intubation or the surgical operation itself may also induce reflux of stomach contents or vomiting in the patient. Once the food or water in the stomach is choked into the trachea, it may cause aspiration pneumonia in mild cases or airway obstruction in severe cases, causing asphyxia and directly endangering life safety. Therefore, it is necessary to strictly comply with the doctor’s orders, which means that you must strictly fast from food and water. If necessary, the preoperative surgeon will provide intravenous fluids to compensate for the lack of energy or water due to fasting and water deprivation.