When you have a cold or flu, the doctor (or Dr. Mom) may tell you to drink lots of fluids. But did they ever explain why you need to guzzle all that water and juice? The extra fluid helps prevent dehydration, which can make you feel even worse, and make it harder to get well. If you have a runny nose, a feverish sweat, or vomiting and diarrhea, it may seem obvious why you'd need to drink more to replace those lost fluids. But these aren't the only reasons the body needs extra fluid when you're sick.
當你不幸患了感冒或流感時，醫生（或者媽媽）可能會叮囑你要多喝液體，但他們是否曾解釋過為什么你要狂喝水和飲料？額外的液體可以避免脫水，一旦脫水你會感覺更糟，也更難康復。如果你出現流鼻涕、發燒出汗、或者嘔吐腹瀉等癥狀，顯然你需要多喝液體以彌補身體失去的水分。但這些并非你生病時身體需要多補水的全部原因。
If you have a fever, that increase in body temperature increases your metabolism–in other words, all the biochemical reactions that keep you alive speed up. A fever of 101 degrees Fahrenheit increases your body's metabolic rate by about 10%. What difference does that make?
若你發燒，體溫的升高將加快你的新陳代謝，換句話說，所有維持生命的生化反應將加速。101華氏度的高燒將使身體的代謝速率增加百分之十。這又有什么分別呢？
Two key ingredients of metabolic reactions are water and oxygen. Increased metabolism uses more water and also makes you breathe faster, to supply the extra oxygen. And guess what? As you breathe faster, you breathe out more moisture, along with more carbon dioxide.
新陳代謝作用的兩大主要成分是水和氧。新陳代謝加快需要更多的水，也使你呼吸加快以補充足夠的氧。你猜接下來會怎么著？當你呼吸加快，你也將呼出更多的濕氣和二氧化碳。
So even if you don't have symptoms that cause obvious water loss–like a runny nose, sweating, vomiting or diarrhea–a cold or flu can dehydrate you in hidden ways. Just a slight rise in body temperature requires more water for metabolic reactions and breathing.
即便你沒有會引起明顯失水的癥狀，如流鼻涕、出汗、嘔吐和腹瀉等，感冒或流感卻以隱蔽的方式導致你脫水。哪怕是體溫一丁點的升高都需要更多的水以維持加快的新陳代謝作用和呼吸。
On top of all that, when you're sick you just might not feel like eating or drinking as much as usual. That's why Mom keeps reminding you to drink your fluids!
除此之外，你生病時食欲可能不如平常，這也是媽媽一直提醒你喝水的原因！
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