Our bodies contain a lot of water — 60% of an adult’s weight, and 80% of a newborn’s weight, is body fluid. In other words, the body of a 70 kg man contains about 42 liters of water.
The water we drink is absorbed by the intestines, and circulated throughout the body in the form of body fluids such as blood. These perform various functions that keep us alive. They deliver oxygen and nutrients to the cells and take away waste materials, which are then eliminated with urination. When the body temperature rises, blood circulation to the skin increases, enabling heat dissipation through sweating, helping to keep the body at a constant temperature.
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Just as water circulates on the planet, it also circulates inside the human body in the form of body fluids. In both cases, it is essential to maintain life.
*Source: https://www.otsuka.co.jp/en/nutraceutical/about/rehydration/water/body-fluid