每天真的要喝八杯水吗？
<p>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。</p><p><span word="Drinking">Drinking</span> <span word="eight">eight</span> <span word="cups">cups</span> <span word="or">or</span> <span word="two">two</span> <span word="litres">litres</span> <span word="of">of</span> <span word="water">water</span> <span word="a">a</span> <span word="day">day</span> <span word="is">is</span> <span word="longstanding">longstanding</span> <span word="advice">advice</span>. <span word="But">But</span> <span word="is">is</span> <span word="there">there</span> <span word="any">any</span> <span word="scientific">scientific</span> <span word="basis">basis</span> <span word="for">for</span> <span word="it">it</span>, <span word="asks">asks</span> <span word="Dr">Dr</span> <span word="Chris">Chris</span> <span word="van">van</span> <span word="Tulleken">Tulleken</span>.</p><p><span word="You">You</span> <span word="know">know</span> <span word="those">those</span> <span word="ads">ads</span> <span word="that">that</span> <span word="remind">remind</span> <span word="us">us</span> <span word="that">that</span> <span word="even">even</span> <span word="a">a</span> <span word="small">small</span> <span word="drop">drop</span> <span word="in">in</span> <span word="hydration">hydration</span> <span word="levels">levels</span> <span word="can">can</span> <span word="massively">massively</span> <span word="affect">affect</span> <span word="performance">performance</span> <span word="so">so</span> <span word="you">you</span> <span word="need">need</span> <span word="to">to</span> <span word="keep">keep</span> <span word="hydrated">hydrated</span> <span word="with">with</span> <span word="whatever">whatever</span> <span word="brand">brand</span> <span word="of">of</span> <span word="isotonic">isotonic</span> <span word="super">super</span> <span word="drink">drink</span> <span word="they">they</span>'<span word="re">re</span> <span word="selling">selling</span>?</p><p><span word="They">They</span> <span word="seem">seem</span> <span word="pretty">pretty</span> <span word="scientific">scientific</span> <span word="don">don</span>'<span word="t">t</span> <span word="they">they</span>? <span word="Man">Man</span> <span word="in">in</span> <span word="white">white</span> <span word="coat">coat</span>, <span word="athlete">athlete</span> <span word="with">with</span> <span word="electrodes">electrodes</span> <span word="attached">attached</span> <span word="and">and</span> <span word="so">so</span> <span word="on">on</span>. <span word="And">And</span> <span word="it">it</span>'<span word="s">s</span> <span word="not">not</span> <span word="a">a</span> <span word="hard">hard</span> <span word="sell">sell</span> <span word="because">because</span> <span word="drinking">drinking</span> <span word="feels">feels</span> <span word="right">right</span> - <span word="you">you</span>'<span word="re">re</span> <span word="hot">hot</span> <span word="and">and</span> <span word="sweating">sweating</span> <span word="so">so</span> <span word="surely">surely</span> <span word="replacing">replacing</span> <span word="that">that</span> <span word="fluid">fluid</span> <span word="must">must</span> <span word="be">be</span> <span word="beneficial">beneficial</span>.</p>
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