We need to drink less than other animals but we don’t know why

New research shows that the human body uses 30% to 50% less water per day than chimpanzees, gorillas, bonobos and orangutans.

For the first time, it has been accurately measured how much water humans lose and replace each day compared to primates.

The study compared the water turnover of 309 people with a variety of lifestyles, from farmers and hunter-gatherers to office workers, with that of 72 apes. Water intake through food and drink, on the one hand, and water lost through sweat, urine and the gastrointestinal tract were calculated. The average person processes about three liters, or 12 cups, of water per day. A chimpanzee or a gorilla living in a zoo suffers twice as much.

Our bodies are constantly losing water: when we sweat, we go to the bathroom, even when we breathe. That water must be replenished to maintain the volume of blood and other body fluids. But an ancient change in our body’s ability to conserve water.

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