Resting energy expenditure in cystic fibrosis patients decreases after lung transplantation, which improves applicability of prediction equations for energy requirement

•REE and REE/kg FFM significantly decrease after lung transplantation in CF patients.•Prediction equations for energy requirement are inaccurate until a year after LTx.•Measuring REE by indirect calorimetry is advised in CF patients before and until one year after LTx.•Pre-LTx, energy requirements are at least 20% higher than predicted with common energy requirement equations.