What is the importance of water content of the body?

1.2. It regulates your body temperature

Staying hydrated is crucial to maintaining your body temperature. Your body loses water through sweat during physical activity and in hot environments. Your sweat keeps your body cool, but your body temperature will rise if you don’t replenish the water you lose. That’s because your body loses electrolytes and plasma when it’s dehydrated. If you’re sweating more than usual, make sure you drink plenty of water to avoid dehydration.