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没有证据表明一天之内除了饮用其他饮料外再喝八杯水会对你有益，事实是这可能对身体有害。生活在温带气候的人若没有保持体力锻炼，一天则需要六至八杯水，不过这些水分可以通过食物、酒或含咖啡因的饮料获得。如果你水喝太多，你就会排尿。如果你水喝太少，你就会口渴，尿也少，这和人体吸收氧气一样受到良好的控制。 Drinking eight cups or two litres of water a day is longstanding advice. But is there any scientific basis for it, asks Dr Chris van Tulleken. You know those ads that remind us that even a small drop in hydration levels can massively affect performance so you need to keep hydrated with whatever brand of isotonic super drink they're selling? They seem pretty scientific don't they? Man in white coat, athlete with electrodes attached and so on. And it's not a hard sell because drinking feels right - you're hot and sweating so surely replacing that fluid must be beneficial. | 
