Are you drinking enough water?

We’re told to drink at least eight glasses of water a day to stay healthy. But is that really enough? And does it have to be water, or do other fluids count?
 
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  • Updated:30 Sep 2001
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01.Introduction

Are-you-drinking-water

In brief

  • Water is essential to life — it’s possible to survive for more than 50 days without eating, but you can live only a few days without water.
  • You need about 2–3 L of water per day to stay healthy — more if it’s hot, you’re sick, you’re exercising or working in air conditioning.
  • Thirst is an emergency response — by the time you’re thirsty, you’re already dehydrated.
  • There are many potential sources of water in our diet — soft drinks, tea and many foods contribute to your daily water quota.
  • Alcoholic drinks are diuretic (they make you urinate more) — and if they’re stronger than 10% alcohol, you’ll lose more water than you take in.

Please note: this information was current as of September 2001 but is still a useful guide to today's market.


How do our bodies use water?

Our bodies consist mainly of water — 50–80% of your total body weight is water. Women typically have lower average body water content than men because they tend to have more body fat, which contains less water than muscle tissue.

And water is vital to all sorts of bodily functions. One key fluid — your blood — helps transport essential nutrients and oxygen around your body. Other fluids act as a lubricant for joints and eyes, help you swallow, act as a cushion for your nervous system, and help with waste disposal. On top of all that, water serves to regulate your body temperature — you sweat when you get too hot.

There are other ways in which water contributes to good health:

  • It maintains the health of your kidneys by helping flush toxins and body waste through them.
  • It reduces the risk of stones in your urinary tract (kidney stones or bladder stones).
  • Some preliminary research has shown that drinking plenty of fluid (particularly plain water) can reduce the risk of cancers of the colon and urinary tract (including kidneys and bladder) and breast cancer. However, more research is needed before definitive conclusions can be drawn.
  • It’s thought that drinking more water (but not fatty or sugary drinks) could help prevent childhood and adolescent obesity, partly because it creates a feeling of fullness and also because people sometimes mistake feeling thirsty for feeling hungry.
 
 

 
 
 

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