Water is important for many reasons. Between 55 and 75 percent of the body is water. Water is needed for cooling the body on hot days, and when we are working or exercising. Water carries body heat to the surface of the skin.
Doctors say adults should drink about two liters of water a day to replace（替换） all the water lost in liquid waste and perspiration（出汗）. They say people should drink more than that in hot weather. It is important to drink before, during and after exercise. They say we should drink water even before we start to feel like we need something to drink. During hot weather, cool liquids（液体） are best. But don’t drink sweet drinks and alcohol.
Doctors also say it is possible to drink too much water. Some people, for example, do this if they exercise hard during a heat wave. The result is that the amount of water in the body increases. This causes cells（细胞） to become larger and sodium（钠） in blood to become too low. So when runners exercise or others work hard in hot weather, they’d better drink a sports drink with sodium in it.
Doctors say actions other than drinking water can protect against the health dangers of heat. Eat fewer hot and heavy foods. If possible, cook foods during cooler times of the day. Also, rest more often. Physical activity produces body heat. These simple steps can prevent the health problems because of heat. They will prevent sickness, help you feel better and may even save your life.
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