Nutritional Strategies to Address Malnutrition in Dialyses Patients: A Systematic Review

Background/Objectives: Protein-energy wasting (PEW) is a common complication in patients with chronic kidney disease (CKD) receiving renal replacement therapy by dialyses. This condition is associated with higher morbidity, mortality, and poorer quality of life. The aim of this systematic review was to evaluate the effectiveness of different nutritional strategies-such as oral nutritional supplements and intra-dialytic parenteral nutrition-in improving the nutritional status of these patients. Methods: A systematic review was carried out in accordance with the PRISMA statement. Searches were performed in PubMed, BVS, and Scopus between January and March 2025. Randomised or controlled clinical trials published in English or Spanish, available in full text, involving adults on haemodialysis (HD) or peritoneal dialyses (PD) were included. Fourteen studies met the inclusion criteria. Results: The nutritional interventions assessed produced consistent benefits in biochemical markers (e.g., serum albumin), muscle mass, inflammatory indices, and perceived quality of life. Intra-dialytic supplementation and multidisciplinary management were particularly effective in patients with moderate-to-severe malnutrition. Conclusions: Malnutrition is frequent and clinically significant in dialyses patients. Nutritional strategies-including oral supplementation, IDPN, and personalised counselling-effectively prevent and treat PEW. Early, tailored, evidence-based, and multidisciplinary implementation could decisively improve clinical prognosis and quality of life in this population.