Low fluid intake is more harmful to kidney health than high fluid intake
Evidence consistently shows that low fluid intake and dehydration impair kidney function and increase the risk of renal injury, supporting the premise that inadequate hydration is detrimental to kidney health.
The claim states that low fluid intake is more harmful to kidney health than high fluid intake. Several papers (e.g., [3], [8], [10]) document the negative renal outcomes, reduced kidney function, and increased risk of acute kidney injury associated with inadequate hydration and dehydration. None of the provided papers argue that high fluid intake is more harmful than low fluid intake, leaving the evidence one-sided in favor of the claim.
Mirabito Colafella KM, Nguyen PNH, McArdle Z, Fong D, Kwok E, Denton KM, Vinh A, Krause LMH. Impact of recurrent dehydration with mild periodic water restriction on blood pressure and renal function in male spontaneously hypertensive rats.. 2026. https://doi.org/10.1113/ep092812
Demonstrates that inadequate hydration and water restriction lead to adverse renal function and markers of renal dysfunction.
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Domeier C, Robinson AT, Babcock MC, Vondrasek JD, Bissen TG, Muñoz CX, Smith KA, Watso JC. Acute kidney injury biomarker responses in young and older female adults following mild hypohydration.. 2026. https://doi.org/10.1152/ajprenal.00414.2025
Shows that hypohydration reduces kidney function and increases acute kidney injury biomarker responses.
Hooper L, Parkinson E, Abdelhamid AS, Deng K, Edozie O, Fenner C, Frost L, Ganeshamoorthy M, Mohandas S, Robson J, Sharif A, Wolmarans C, Bunn DK. Prevalence of low-intake dehydration in hospitalised older adults: systematic review and meta-analysis.. 2026. https://doi.org/10.1136/bmjph-2025-002985
Indicates that low-intake dehydration is associated with poor health outcomes and negative impacts in vulnerable populations.
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