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A lady with a hand fan feeling hot and dehydrated.

Important role in thermoregulation
People lose water in various situations in their daily lives.

We sweat not only when playing sports or taking a bath, but also when sleeping, commuting to work or school, and even just sitting in the office or school. Such sweat has the important role of “maintaining a constant body temperature”. When your body temperature rises, you sweat, because when the sweat evaporates, it takes away the heat from the surface of your body and cools it. It’s the same as sprinkling water on the road in summer to make it feel cooler.

In this way, sweat keeps our body temperature constant, which is why our bodies are able to function normally and stay healthy.


Function of water in the body

  • Water (bodily fluids) in the body plays a very important role in our bodies.
  • Carry nutrients throughout the body.
  • Eliminate unnecessary garbage (waste) from the body.
  • Regulate body temperature.


Daily water balance

Even if we live a normal life, we lose 2.5 liters of water per day from our bodies through urine, sweat, and breathing. On the other hand, the amount of water that comes in from drinks and food is also 2.5 liters per day.

Therefore, the amount of body fluid is always kept constant. The reason why you feel thirsty when you sweat a lot is because your body is trying to replenish the lost fluids.