All healthy weight-loss methods advocate drinking eight glasses of water every day. Water is the source of life. Replenishing enough water to the body can promote metabolism and take away the garbage in the body. And drinking water often can make your skin more tender. But don't drink too much water, or it will cause edema, especially one hour before going to bed at night. Drinking a glass of water before meals will make you feel full and reduce your calorie intake. It is easy for students to overeat in the canteen. This method can make you eat less without delaying your health.