Is too much protein bad for your kidneys?
Reviewed and updated · Methodology
Multiple systematic reviews (Devries et al., 2018) in healthy adults found no evidence that high-protein diets damage kidney function or markers like GFR.
Short-term elevations in GFR on high-protein diets represent normal kidney adaptation, not injury.
People with pre-existing CKD are a genuine exception. In those populations, moderate protein restriction can slow disease progression, but the targets are individualized.
Staying well-hydrated and getting protein from a mix of animal and plant sources is a reasonable default for high-protein eaters.
Do I need to drink extra water on a high-protein diet?
Adequate hydration is sensible at any intake. There is no evidence that high-protein diets cause dehydration, but fluid needs rise with activity, heat, and caffeine intake.
What about gout or kidney stones?
People with a history of uric-acid stones or gout may need to moderate very high purine intakes (e.g., organ meats, some seafood). Plant and dairy proteins are generally fine.
- NIH Office of Dietary Supplements — Dietary Supplements for Weight Loss — Federal guidance on protein, supplements, and weight management
- ISSN Position Stand: Protein and Exercise — Peer-reviewed consensus: 1.4–2.0 g/kg for active adults
- NASEM Dietary Reference Intakes — Protein — Institute of Medicine DRI for protein (RDA 0.8 g/kg, AMDR 10–35%)
Nutrition data is verified against the product’s Nutrition Facts label and the brand’s official spec sheet. See our full ranking methodology for the scoring formula and inclusion rules.