The main benefit of drinking plain water in the morning is to hydrate the body. Water is an essential nutrient for life activities. First of all, water is a good solvent, many chemical reactions need to be carried out in a water environment; at the same time, water itself is also involved in a variety of biochemical reactions, water can also transport a variety of nutrients as well as wastes; water can provide a liquid environment for the living organisms in the thermoregulation of the body temperature and other aspects of the play an important role. So drinking water in the morning can replenish enough water for the body. After a night of metabolism, the human body in the morning is relatively dehydrated state, this time a small number of times to drink some water, can help the body quickly replenish water. At the same time, drinking water in the morning is conducive to increasing satiety, for the need to control weight of the population, can accordingly reduce the intake of other foods, conducive to weight control. It is recommended that you can drink about 200 to 250 milliliters of plain water in the morning. But if you drink milk and porridge and other water-rich foods for breakfast, you need to reduce the amount of plain water accordingly.