每天必须喝八杯水吗?

If you're confused about how much water you really need, I'm not surprised. Conflicting advice in recent headlines appears to contradict the old "8-a-day" advice we all grew up with. Is it necessary to chug down eight glasses of water daily, or is this recommendation exaggerated and out of date?

We've heard for years that eight glasses of water daily is the minimum necessary to keep healthy. Your weight loss and health depend on it. Drink the minimum and see clearer skin, better sleep, better sex, improved vision. We're warned of impending dehydration without at least eight glasses. But, the tide has turned, away from liquid nutrition toward examining your daily diet, including what you eat, as well as what you drink.

The answer is... you need what you need! If it's summer, you need more. If you're exercising, you need more. If you're a "normal" sedentary person, who's not perspiring, and not exercising more than 15-20 minutes daily, Dr. Heinz Valtin of Dartmouth Medical School says you need no more than four glasses of water daily. Most beverages can be counted as part of your daily fluid intake. Although the World Health Organization recommends that everyone drink a minimum of two liters of water daily, or about eight cups, the old "8X8" rule is based on studies performed on people under extraordinary circumstances; including soldiers at high altitude and hospitalized patients -- what you and I need is different.如果你们依然对我们真正需要喝多少杯水能够保证健康感到困惑，我一点也不觉得惊讶。不一致的喝水建议出现在近来的打字标题与我们一直成长以来“每天喝八杯水”的建议想抵触。真的有必要每天要喝够八杯水吗，或者这是言过其实的建议吗？

我们曾经听说过每天八杯水是人体保证健康的最低要求。你的体重减少和健康与否主要依靠它。每天喝水量的最低要求会随你的肤色、性别而改变的。我们被告诫不合够八杯水身体就会迫近脱水状况。但这种说法已经发生了改变，已经脱离了液体营养，而视个人身体需要来决定你的喝水量，包括你吃的东西和你喝的东西。

那答案是……你的身体需要多少你就喝多少水!如果在夏天，你就需要喝更多的水。如果你在运动，你也需要喝更多的水。如果你是一个正常的，且惯于久坐的，又不怎么会出汗，和一天运动不超过15到20分钟的人，达特献斯医学院的沃林特博士认为在这样的情况下，只需要4杯水就可以满足人体需要。大部分饮料是也被归入每天需要的饮水量的范围里。

尽管世界卫生组织推荐每人每天最低限度喝2升的水，或大约8杯水。老规则“8*8”是以人们处于非常时期俄环境为基础制定的，包括处于高海拔的士兵和正在就医的病人。——所以我和你所需要的饮水量是不同的。