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Leptin and ghrelin are peptide hormones which, working antagonistically, regulate the energy balance of the body. The aim of the study was to evaluate the levels of leptin and ghrelin in the blood serum of patients diagnosed with cystic fibrosis (CF), in relation to their nutritional status and function of liver cells. The study group consisted of 34 patients, aged from 3 months to 18 years (mean...