每天必須喝八杯水嗎?

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 Is it necessary to chug down eight glasses of water daily, or is this recommendation exaggerated and out of date?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.如果你們依然對我們真正需要喝多少杯水能夠保證健康感到困惑，我一點也不覺得驚訝。不一致的喝水建議出現在近來的打字標題與我們一直成長以來“每天喝八杯水”的建議想牴觸。真的有必要每天要喝夠八杯水嗎，或者這是言過其實的建議嗎？

我們曾經聽說過每天八杯水是人體保證健康的最低要求。你的體重減少和健康與否主要依靠它。每天喝水量的最低要求會隨你的膚色、性別而改變的。我們被告誡不合夠八杯水身體就會迫近脫水狀況。但這種說法已經發生了改變，已經脫離了液體營養，而視個人身體需要來決定你的喝水量，包括你吃的東西和你喝的東西。

那答案是……你的身體需要多少你就喝多少水!如果在夏天，你就需要喝更多的水。如果你在運動，你也需要喝更多的水。如果你是一個正常的，且慣於久坐的，又不怎麼會出汗，和一天運動不超過15到20分鐘的人，達特獻斯醫學院的沃林特博士認爲在這樣的情況下，只需要4杯水就可以滿足人體需要。大部分飲料是也被歸入每天需要的飲水量的範圍裏。

儘管世界衛生組織推薦每人每天最低限度喝2升的水，或大約8杯水。老規則“8*8”是以人們處於非常時期俄環境爲基礎制定的，包括處於高海拔的士兵和正在就醫的病人。——所以我和你所需要的飲水量是不同的。