If the food you eat is not digested because of acute gastroenteritis, you need to fast for a period of time, and if necessary, you can replenish your body fluids by means of infusion. The onset of acute gastroenteritis is caused by an uncontrolled diet, imbalance of intestinal flora, and overgrowth of pathogenic bacteria. During an attack, the gastrointestinal tract is affected by bacterial and inflammatory stimuli, and peristalsis is accelerated to expel the contents of the gastrointestinal tract. Since food is excreted without digestion and absorption, there are manifestations such as indigestion of food. During an attack of acute gastroenteritis, all food and water should be fasted so that the stomach and intestines can get enough rest and the symptoms can be relieved. If the symptoms do not improve after a period of fasting or if dehydration has occurred, the blood volume in the body can be replenished by means of infusion to avoid water-electrolyte disorders.