Dietary Protein Management in Chronic Kidney Disease

Chronic kidney disease (CKD) affects a growing proportion of the global population, imposing substantial clinical and economic burdens. Progressive loss of renal function impairs the clearance of nitrogenous waste products and disturbs fluid, electrolyte and acid–base homeostasis. Dietary protein management has emerged as a cornerstone of conservative CKD care, aiming to slow loss of glomerular filtration rate (GFR), reduce the accumulation of uremic toxins and minimise complications such as hyperphosphataemia, metabolic acidosis and proteinuria. Strategies range from modest protein restriction (0.8 g/kg/day) to more pronounced reductions (0.4–0.6 g/kg/day), often coupled with specialised supplements to preserve nutritional status. Plant-dominant regimens and ketoacid analogue supplementation have attracted interest for their potential to attenuate intraglomerular hypertension, favourably modulate the gut microbiome and mitigate inflammation. Optimising protein intake requires a delicate balance: excessive restriction risks protein-energy wasting, whereas higher intake accelerates renal damage and cardiovascular risk. Achieving adherence and tailoring interventions to patient comorbidities, cultural preferences and resource settings are essential to improve outcomes and delay dialysis initiation.

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Dietary Protein Management in Chronic Kidney Disease publication trend

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Technical terms

Glomerular filtration rate (GFR): The volume of plasma filtered through renal glomeruli per minute, used as a standard measure of kidney function.

Uremic toxins: Nitrogenous metabolites that accumulate in kidney failure and contribute to vascular, inflammatory and neurological complications.

Protein-energy wasting (PEW): A syndrome characterised by loss of muscle and fat mass, diminished protein stores and reduced energy reserves in CKD.

Ketoacid analogues: Nitrogen-free analogues of essential amino acids used to supplement very-low-protein diets, preventing malnutrition without increasing nitrogenous waste.

Acid load: The net acid burden imposed by diet, influencing systemic acid–base balance and contributing to renal injury and bone demineralisation.

References

1. Nutritional treatment of advanced CKD: twenty consensus statements. Journal of Nephrology (2018).
2. Management of protein-energy wasting in non-dialysis-dependent chronic kidney disease: reconciling low protein intake with nutritional therapy 1 , 2 , 3 , 4. American Journal of Clinical Nutrition (2013).
3. Plant-Dominant Low-Protein Diet for Conservative Management of Chronic Kidney Disease. Nutrients (2020).
4. Ketoacid Analogues Supplementation in Chronic Kidney Disease and Future Perspectives. Nutrients (2019).
5. The Effect of Ketoanalogues on Chronic Kidney Disease Deterioration: A Meta-Analysis. Nutrients (2019).
6. Ameliorating Chronic Kidney Disease Using a Whole Food Plant-Based Diet. Nutrients (2020).
7. Vegetarian Diet in Chronic Kidney Disease—A Friend or Foe. Nutrients (2017).