Nutrition
Overhydration Kidney Risk
Overhydration kidney risk is real via hyponatremia—excess plain water without electrolytes or clinician limits can harm kidneys and cognition, especially in long hot events.
Overhydration kidney risk appears when excessive plain water dilutes blood sodium—hyponatremia—stressing kidneys and brain, especially during long endurance events or aggressive gallon-a-day trends without matching sweat losses. Healthy kidneys excrete extra water, but limits exist when sodium intake is low or ADH is inappropriate.
Pair fluids with electrolytes on hot long efforts; never force water during nausea or confusion.
Common questions
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Can you drink too much water for kidney health?
Yes—especially with low sodium intake or certain medications. Aim for thirst, urine color, and clinician guidance rather than arbitrary gallon targets.
Related terms
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