Water is so important to life because it’s really good at dissolving things. When things are floating around instead of just sitting still, it’s easier for the chemistry of life to happen.
But *too* much water means it’s less likely for those particles to interact and do the chemistry things. So a balance is important. When you have too much water, the body just dumps it.
That’s why sports drinks like gatorade exist. It has a bunch of stuff dissolved in it, which helps the body keep the water (and also replenishes what you lose through sweat).
(Also, the body doesn’t want cells absorbing too much water because of osmosis and popping).
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