Your body tries to maintain homeostasis. That’s, broadly, a balance of water, electrolytes and sugar in the blood. One of the biggest problems of drinking too much water is that the water dilutes the other two, and that causes things to malfunction. Too little sodium (by volume) causes water to enter cells to be stored, which causes them to swell. That can happen in the brain, and once the brain starts to swell up you’re screwed.
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