Generally speaking, the basic amount of water needed by the human body is about 1500ml a day. And in summer, due to the hot weather, people sweat more, at least 2000ml or more, and this amount can also be properly adjusted according to the amount of sweating, and can even reach about 2500ml. Because water is an important substance to maintain the body’s metabolism, it is involved in various physiological activities of the body, if a prolonged lack of water, will lead to an increase in toxins in the body. Once the toxins can not be discharged from the body in time, it may increase the burden on the kidneys, resulting in kidney infections, inflammation and other conditions. However, you should not drink too much water, if you drink too much water a day, it will also increase the burden on the kidneys and may cause symptoms such as puffy eyelids.