The fluid in our bodies contains not just water but also various ions. When we sweat, for example, we lose water and ions from our bodies. POCARI SWEAT contains a balance of water and ions that is close to that of body fluid, enabling smooth replenishment of lost moisture and ions. If you just drink water after sweating a lot, your body fluid becomes thin and diluted. In order to stop this trend, the body causes thirst to disappear, and sometimes stops absorbing water.