Can't lose weight. Drinking milk is mainly to supplement calcium. Taking 1800 mg of calcium every day can make your body absorb 80 calories less. Milk is rich in calcium. Waking up after breakfast and drinking a glass of pure milk can make people work and study energetically all day. Drinking a cup of hot milk before going to bed at night can make people sleep more sweetly. Drinking a cup of yogurt after lunch and dinner can also help digestion and help to lose weight.