Ultra-Processed Food Consumption, Poorer Nutritional Quality, and Lower Muscle Mass in Immediate and Late Postkidney Transplant Periods

Abstract

To assess the consumption of ultra-processed foods (UPFs) in the immediate (2months after transplantation) and late post-transplant (14months after transplantation) periods among kidney transplant patients and to examine its correlation with nutritional quality and body composition. A cross-sectional analysis of 96 kidney transplant recipients divided into 2 groups: immediate post-transplant (n=71) and late post-transplant (n=25). Sociodemographic, anthropometric, and laboratory data were collected and grouped in a database. Food intake was evaluated by a validated food frequency questionnaire and foods were divided according to the NOVA classification system. The consumption of UPFs was calculated and statistical analyses were performed to evaluate its correlation with nutritional components and body composition. The consumption of UPFs was 649.4 [420.0-1061.72] kcal/day, accounting for 33.3±11.9% of the total daily energy intake. The immediate post-transplant group showed higher total daily energy and UPFs intake compared to the late post-transplant group (P=.002 and P=.046, respectively), although the energy contribution of UPFs was similar between both groups. UPFs intake was positively correlated with higher percentages of total fat, trans fat, saturated, monounsaturated fat, polyunsaturated fat, starch, and sodium (P<.05 for all analyses). An inverse correlation was observed between UPFs consumption and the percentage of protein and carbohydrates in the food intake (P=.025 and P=.008, respectively). In the immediate post-transplant group, a higher intake of UPFs was correlated with lower muscle mass (r=-0.250, P=.037). The findings of this study reveal a pattern of increased consumption of UPFs among kidney transplant patients in comparison to the national average. This higher intake of UPFs was correlated with lower nutritional quality during both periods. Moreover, a significant correlation was observed between UPFs consumption and adverse body composition parameters, specifically in the immediate post-transplant period.