Nutrition
Hyponatremia Prevention
Hyponatremia prevention balances fluids and sodium on long efforts—over-drinking plain water without electrolytes can dilute blood sodium dangerously.
Hyponatremia prevention avoids dangerously low blood sodium—often from over-drinking plain water in long hot events while under-replacing sodium. Symptoms include confusion, nausea, and swelling; it is rare but serious in endurance sport.
Drink to thirst, include electrolytes on multi-hour efforts, and know race medical plans.
Common questions
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How much water is too much during a marathon?
Avoid forcing liters beyond thirst—especially without sodium. Use aid-station cups to thirst and electrolyte products per race heat and duration.
Related terms
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