02/25/2026
PREMISE: Protein is still often perceived as harmful for kidney health, but high levels of protein waste in strength trainees are usually healthy responses to increased protein intake - not signs of disease. Eating more protein simply leads to greater protein processing by the body.
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METHODS: A meta-analysis of nearly 150,000 people with chronic kidney disease (CKD) evaluated their plant and animal protein intake. There was low heterogeneity amongst studies for total protein and animal protein (38% and 0%, respectively), while plant protein was higher (77%).
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RESULTS: It was found that higher protein intake correlated with lower rates of chronic kidney disease (both forms of dietary protein RR=0.82), plant protein (RR=0.77), and animal protein (RR=0.86). For animal protein, the benefit was mainly seen in studies with high seafood consumption (RR=0.84).
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APPLICATION: While only correlative in nature, the data consensus are higher-levels of dietary protein, whether plant or animal sources, are significantly associated with lower CKD risk. Even long-term controlled experiments show no evidence that protein harms kidneys - not even in people with pre-existing kidney issues. Overall, high protein intakes are generally safe for your kidneys, but do consult with your P*P or RD if you have kidney problems before using whey protein.
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CITATION: https://pubmed.ncbi.nlm.nih.gov/38946781/