The cells in your body only function properly when they have a certain concentration of water AND a certain concentration of salt (electrolytes). The water and the electrolytes must remain in “water-electrolyte balance” for the cells to survive. Too little water in the cells, they shrink and krinkle up. Too much water inside, they explode.
When you sweat you lose both water and salt. If you replace only the water, the system won’t survive.
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