Your body needs water and electrolytes to function.
When you sweat or pee or lose water in any way, you also lose electrolytes because sweat and pee aren’t pure water, so you’re losing electrolytes as well.
If you only drink water to replace what you lost, you have fewer electrolytes in your system, so your body can’t function properly.
It’s the same reason overhydration exists. Adding pure water to.your body means the electrolytes in your body want to balance out with the electrolyte free water you just added, reducing the amount of electrolytes in your cells.
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