11/12/2025
MYTH: Carnivore / Meat / High Protein Diets Harm Your Kidneys
EVIDENCE: High Protein Diets DO NOT HARM Kidney Function
1. (systematic review + meta-analysis, 28 trials, 2018). “Changes in Kidney Function Do Not Differ between Healthy Adults Consuming Higher- vs Lower-Protein Diets.” Bottom line: higher protein raised eGFR at endline (an adaptive “hyperfiltration”), but when you look at change over time there was no adverse effect on kidney function.
https://pubmed.ncbi.nlm.nih.gov/30383278/
2. (1-year prospective study in trained adults, ~2.5–3.3 g/kg/day). Antonio et al., 2016. No harmful effects on kidney (or liver) markers despite very high protein for a full year. https://pubmed.ncbi.nlm.nih.gov/27807480/
3. (feeding trial / RCT-level control). Juraschek et al., 2013. A higher-protein diet increased eGFR (expected, adaptive) without evidence of damage; long-term harm not observed in the trial period.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3602135/
4. (sports-nutrition position + data set). High-protein + heavy resistance training (~3.4 g/kg/day). Improved body composition with no adverse renal effects in healthy trained men and women.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4617900/
5. (older but still cited athletic cohort). Poortmans & Dellalieux, 2000. Protein intakes up to ~2.8 g/kg/day in well-trained athletes did not impair renal function (creatinine clearance, albumin excretion).
https://pubmed.ncbi.nlm.nih.gov/10722779/
6. (recent evidence on risk, general populations). 2024 meta-analysis (Frontiers in Nutrition). Higher total, animal, and plant protein intakes were associated with lower CKD risk and, in people without CKD, higher protein was linked to higher eGFR (again, adaptive), not decline.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2822055