Klin Onkol 2025; 38(5): 345-347. DOI: 10.48095/ccko2025345.
Background: Haematopoietic stem cell transplantation is associated with increased demands for adequate caloric intake and heightened risk of macronutrient and micronutrient depletion. Carbohydrates, proteins, and fats represent a key source of energy and structural components for transplanted patients, who often have limited oral intake because of mucositis and loss of appetite and increased nutritional requirements due to catabolism, inflammation, and tissue regeneration. Deficiencies in vitamins and trace elements occurring in some patients play a crucial role in enzymatic reactions, antioxidant defense, immune function, and tissue repair. Preparative regimen also causes damage of the intestinal mucosa and, in combination with antibiotic therapy, reduces the diversity of the microbiome. According to the latest evidence, patient nutrition has an impact on the short- and long-term outcomes of transplantation. Recognition of malnutrition and catabolism in these patients is difficult in routine practice; closer analysis of body composition and early intervention by a clinical nutritionist may be helpful. Adequate nutrient replacement is an important aspect of maintaining nutritional balance and good recovery. Aim: The aim of this article is to provide an overview of nutrition, its specific components and nutritional disorders in oncology patients, as well as to summarize specific complications of aggressive treatment in patients undergoing hematopoietic stem cell transplantation and underline the need for early nutritional intervention in this group of patients.