Moderate Protein Restriction Linked to Better Kidney Outcomes in CKD: Study
Israel: Researchers have found in a new study that over 15 years, a moderately protein-restricted diet was associated with a reduced risk of progression to dialysis in patients with stage 3–4 chronic kidney disease. While trends toward lower rates of significant eGFR decline and all-cause mortality were observed, they did not reach statistical significance. The findings support current guideline-based dietary management, with an emphasis on practical implementation.
The study, published in JAMA Network Open, was conducted by Ilia Beberashvili and colleagues from the Nephrology Division at Yitzhak Shamir Medical Center, Israel. It explored the long-term association between dietary protein intake and kidney outcomes in adults with stages 3 and 4 CKD using real-world clinical data over a follow-up period of up to 15 years.
For this purpose, the researchers carried out a retrospective cohort analysis including 1,441 adults with CKD stages 3–4. Dietary protein intake was objectively estimated using 24-hour urinary nitrogen excretion and normalized to body weight (nDPI). Participants were categorized into lower (<1.0 g/kg/day) and higher (≥1.0 g/kg/day) protein intake groups. Propensity score matching was applied to balance baseline characteristics, resulting in 530 patients (265 in each group) for comparative analysis. The primary outcome was a composite of at least 50% decline in estimated glomerular filtration rate (eGFR), initiation of long-term dialysis, or all-cause mortality.
Key Findings:
- Lower protein intake (nDPI <1.0 g/kg/day) was associated with a significantly reduced risk of the composite outcome compared to higher intake.
- The observed benefit was largely driven by a lower incidence of progression to long-term dialysis in the lower protein group.
- Adjusted analyses confirmed that reduced protein intake remained independently linked to better kidney outcomes.
- A numerically slower decline in eGFR was seen in the lower protein group; however, the difference was not statistically significant.
- Trends toward reduced all-cause mortality were observed but did not achieve statistical significance.
- No significant differences were found in albuminuria progression between the two groups.
- Nutritional parameters remained stable across both groups, indicating no increased risk of malnutrition with moderate protein restriction.
The findings provide reassurance regarding the safety of moderate protein restriction in CKD management, addressing long-standing concerns about potential nutritional compromise. The authors highlighted that objective monitoring of dietary protein intake, such as through urinary nitrogen measurements, may enhance adherence and optimize patient outcomes.
Overall, the study supports existing clinical recommendations advocating controlled protein intake in CKD and underscores the importance of integrating practical, evidence-based dietary strategies into routine nephrology care.
Reference:
Beberashvili I, Baevsky T, Shmuel D, Yoles I, Rosen M, Efrati S. Protein Intake and Kidney Outcomes in Nondialysis Chronic Kidney Disease Over 15 Years. JAMA Netw Open. 2026;9(4):e269575. doi:10.1001/jamanetworkopen.2026.9575
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