What does sodium do for hydration?

This page is relevant to athletes, HYROX athletes, runners, strength athletes, people with physically demanding jobs, early risers, and anyone who sweats a lot or wants to take their hydration more seriously.

Many people drink more water when they are thirsty or feel weak. But you also lose sodium when you sweat. If you replenish only water and no electrolytes, your fluid balance may be supported less optimally.

Sodium is an electrolyte. Electrolytes are minerals involved in fluid balance, nerve function, and muscle function. Sodium helps the body retain fluids more effectively and therefore plays a central role in effective hydration.