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Water plays an important role in keeping you healthy. This should come as no surprise. Much of your body is made up of this clear liquid, after all. It keeps your body working properly. but did you know that too much water can poison (使……中毒) you?

water poisoning happens when people drink too much water for their kidneys (肾脏) to process. this lowers the level of sodium (钠) in their blood to dangerous levels.

you probably already know that high levels of sodium can be unhealthy. that’s true， but low levels are also harmful. when you have too little sodium in your body， your cellsbegin to swell (肿胀). as a result， a lot of things will go seriously wrong in your body.

your brain may begin to swell. you may get a headache， feel very tired and want to throw up. you may even lose consciousness (意识). In these cases, water poisoning can be deadly. You will need to be rushed to a hospital right away.

Protecting yourself from water poisoning may seem easy — just don’t drink too much water, right? In some situations, however, this is easier said than done. For example, when you do some heavy exercise, such as running a marathon, you may have to drink a lot of water. It is then important to balance the amount of water you drink with the amount of water your body is losing through sweat. This can help you stay healthy whenever you are exercising.

So, how much water should a person drink each day? For years, we have been told to drink two liters of water a day. But in fact, the actual amount needed is different for each person. Today, most doctors are telling people that they should drink water whenever they feel thirsty.We can’t live without water. Neither can we live with too much water in our bodies. Make sure you take the right amount of it each day — staying healthy is all about staying balanced!