Lower Protein Intake Linked to Lower Dialysis Risk in CKD Study

Lower measured protein intake was tied to a lower chance of ending up on dialysis in adults with stages 3 and 4 chronic kidney disease, sharpening a long-running debate over how much protein is too much when kidney function is already impaired.

The cohort study, Protein Intake and Kidney Outcomes in Nondialysis Chronic Kidney Disease Over 15 Years, followed adults with nondialysis CKD receiving care in Clalit Health Services in Israel. Researchers used objectively measured dietary protein intake, not self-report, estimating intake from 24-hour urinary nitrogen excretion and normalizing it to adjusted body weight. The index period ran from January 1, 2007, through December 31, 2022, and follow-up extended for as long as 15 years.

That design matters because kidney nutrition advice has never been one-size-fits-all. In the study’s supplemental material, low protein intake was defined as less than 1.0 g/kg/day, while high intake was 1.0 g/kg/day or more. In the measured group, lower intake was associated with lower dialysis risk over time, and the report noted no sign of nutritional harm in that cohort. For clinicians trying to balance kidney protection against undernutrition, that combination is the key clinical nuance.

The findings also line up with long-standing National Kidney Foundation guidance. For people with CKD who are not on dialysis, a lower-protein diet is recommended. Once a patient is on dialysis, protein needs rise. The foundation also warns that too little protein can lead to malnutrition at any stage of kidney disease, which is why the new data are likely to draw close attention from nephrologists and renal dietitians rather than simply reinforcing a blanket restriction.

The study lands in a market where protein is often sold as a universal good, but kidney disease keeps exposing the limits of that message. It also comes after a 2024 JAMA Network Open study of 8,543 adults 60 and older, which found that higher total, animal, and plant protein intake was linked with lower all-cause mortality in people with mild or moderate CKD. Taken together, the evidence points to a more segmented message: protein advice changes with CKD stage, dialysis status, and the risk of wasting, not just with the latest nutrition trend.