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水的作用远比人们所想像的重 要。血液的85％、大脑的75％、肌肉的70％都是水。缺水会削弱注意力、协调性和反应能力,减弱耐力并危及肌体的抗病能力。它还会使血液变浓,减慢及削弱运血液输氧气等物质的速度及排除废弃物的能力。 一般人们每天可从食物中获得3.5杯水,还有半杯为新陈代谢的副产品。但损失的水却为10杯,其中6杯被排泄出去了,2杯通过呼吸蒸发了,2杯在日常活动（不包括运动）中消耗了。显然,每个人每天最少要喝6到8杯水。参加运动的人因为出汗多,需要饮用更多的水。
The role of water is far more important than people think. 85% of the blood, 75% of the brain, and 70% of the muscle are water. Water scarcity weakens attention, coordination and responsiveness, weakens endurance and compromises the body’s resistance to disease. It can also thicken blood, slow down and weaken the ability of blood to deliver oxygen and other substances and eliminate waste. The average person gets 3.5 glasses of water per day from food and half a cup of metabolized by-product. But the loss of water was 10 cups, of which 6 cups were excreted, 2 cups evaporated through the breath, 2 cups consumed in daily activities (excluding exercise). Obviously, everyone should drink at least 6 to 8 glasses of water a day. People who exercise because they sweat more, need to drink more water.