Chronic kidney disease has become a serious public health issue, as well as others health problems such as hypertension, DM, and obesity. Mediterranean diet (MD) can reduce the risk of cardiovascular disease and cancer and can lead to weight loss in obesity. There are studies that suggest that MD could be the diet of choice for patients with CKD for its influence on endothelial function, inflammation, lipid profile and blood pressure. There are few studies that tell us how to adapt MD to this group of patients. This review aims to offer a practical approach to Mediterranean diet adaptation as nutritional treatment in CKD patients.

Protein-energy wasting (PEW) is associated with increased mortality and differs depending on the chronic kidney disease (CKD) stage and the dialysis technique. The prevalence in non-dialysis patients is understudied and ranges from 0 to 40.8%. To evaluate the nutritional status of a group of Spanish advanced CKD patients by PEW criteria and subjective global assessment (SGA). Cross-sectional study of 186 patients (101 men) with a mean age of 66.1±16 years. The nutritional assessment consisted of: SGA, PEW criteria, 3-day dietary records, anthropometric parameters and bioelectrical impedance vector analysis. The prevalence of PEW was 30.1%, with significant differences between men and women (22.8 vs. 33.8%, p < 0.005), while 27.9% of SGA values were within the range of malnutrition. No differences were found between the 2methods. Men had higher proteinuria, percentage of muscle mass and nutrient intake. Women had higher levels of total cholesterol, HDL and a higher body fat percentage. The characteristics of patients with PEW were low albumin levels and a low total lymphocyte count, high proteinuria, low fat and muscle mass and a high Na/K ratio. The multivariate analysis found PEW to be associated with: proteinuria (OR: 1.257; 95% CI: 1.084-1.457, p=0.002), percentage of fat intake (OR: 0.903; 95% CI: 0.893-0.983, p=0.008), total lymphocyte count (OR: 0.999; 95% CI: 0.998-0.999, p=0.001) and cell mass index (OR: 0.995; 95% CI: 0.992-0.998). Malnutrition was identified in Spanish advanced CKD patients measured by different tools. We consider it appropriate to adapt new diagnostic elements to PEW criteria.

Patients with end-stage kidney disease (ESKD) are at high risk of malnutrition and subsequent related mortality when starting dialysis. However, there have been few clinical studies on the effect of nutritional interventions on long-term patient survival. A 2-year longitudinal study was conducted from January 2012 to December 2016. A total of 186 patients with non-dialysis ESKD started the nutritional education program (NEP), and 169 completed it. A total of 128 patients participated in a NEP over 6 months (personalized diet, education and oral supplementation, if needed). The control group (n = 45) underwent no specific nutritional intervention. The hospitalization rate was significantly lower for the patients with NEP (13.7%) compared with the control patients (26.7%) (p = 0.004). The mortality odds ratio for the patients who did not receive NEP was 2.883 (95% CI 0.993–8.3365, p = 0.051). The multivariate analysis showed an independent association between mortality and age (OR, 1.103; 95% CI 1.041–1.169; p = 0.001) and between mortality and the female sex (OR, 3.332; 95% CI 1.054–10.535; p = 0.040) but not between mortality and those with NEP (p = 0.051). Individualized nutrition education has long-term positive effects on nutritional status, reduces hospital admissions and increases survival among patients with advanced CKD who are starting dialysis programs.

Malnutrition is one of the stronger predictors of morbi-mortality in end-stage kidney disease patients. Moreover, malnutrition in hospitalized patients severely affects multiple clinical outcomes, increasing the risk of complications. The Nutritional Risk Index and Geriatric Nutritional Risk Index are indexes used to evaluate the risk of malnutrition in hospitalized adults, which have been validated for dialysis patients and have been reported to be a validated prognostic index of nutrition-related morbidity and mortality. Objectives: The aim of this study is to evaluate the prevalence of early postoperative infections and their possible relationship with malnutrition in renal transplantation. Methods: We conducted a retrospective observational study, including all patients who received a kidney transplant, a total of 140, between January 2020 and December 2023, at a tertiary-level Spanish hospital. Results: The average GNRI was 110.1 ± 11.6, equivalent to adequate nutrition, and only 16.4% of patients were at risk of malnutrition. The mean NRI was 111.4 ± 11.8, equivalent to no risk of malnutrition, and only 17.2% of patients had a moderate-to-severe risk of malnutrition. A total of 30 patients (21.4%) required oral nutritional supplementation at discharge, especially modular protein supplements (86.7%), and 52 patients (37.1%) presented an infection during their stay. The most frequent infections were urinary tract infections (69.8% of the total). Malnutrition calculated by the GNRI or NRI correlated to a longer postoperative hospital stay and a higher rate of infectious complications (p < 0.05). Conclusions: Malnourished patients have a higher risk of early postoperative complications, including infection, and a longer hospitalization stay. The evaluation of nutritional status for the diagnosis and treatment of malnutrition is strongly recommended in ESKD patients on the waiting list for a kidney transplant.

Nutrition throughout kidney disease is linked to a large number of restrictions. Currently, nutritional recommendations for patients with kidney disease are changing, presenting elements in common with the general population. It is recommended to reduce the consumption of ultra-processed foods, as they are enriched in salt, fats and additives, many of which are phosphorus and potassium additives; these additives have a bioavailability of 100%, compared to dietary phosphorus and potassium found in foods of natural origin, with an absorption of between 50-80%, depending on the type of food.Dietary potassium management is one of the major problems in the renal population. It is now being shown that increased blood potassium levels have more causative agents than just dietary potassium intake, such as prolonged fasting, constipation, poor metabolic control of glucose and the use of certain drugs, among other factors.These data show that before resorting to dietary restriction of dietary potassium sources, new approaches should be considered.