Drinking a moderate amount of water on an empty stomach in the morning can effectively help replenish the body’s water loss and promote gastrointestinal motility. Because sleep after a night of respiration, sweat and other consumption, the body is in a state of dehydration. Moisture is necessary to maintain the life of the material, the morning fasting moderate drinking water can maintain the normal operation of the body, replenish the body loss of water, while promoting gastrointestinal peristalsis. If the water intake is insufficient or excessive loss can lead to dehydration. Water is one of the body’s important nutrients, but if a large amount of water intake within a short period of time may appear weakness, fatigue, nausea and vomiting, and other symptoms, and in serious cases can cause water intoxication. Morning fasting is not recommended to drink excessive amounts of ice water, so as not to stimulate the stomach and intestines appear uncomfortable reaction, such as abdominal pain, diarrhea and other symptoms. It is recommended that according to the individual’s physical fitness, activity level and changes in the surrounding environment, a moderate amount of water can be replenished throughout the day to avoid the harm caused by too much or too little water intake.