Abstract
Background/Objectives
Predictive equations estimate post-bariatric surgery resting energy expenditure (REE), but lack accuracy assessment, especially for the remaining body mass. This study aimed to evaluate the agreement between indirect calorimetry and REE predictive methods.
Subjects/Methods
It enrolled 226 females [median age 43.0 (36.2; 50.4) years] who underwent mid- to long-term post-Roux-en-Y gastric bypass [median postoperative time 6.1 (4.0; 9.0) years]. The measured REE (mREE) was obtained using indirect calorimetry, while the estimated REE (eREE) was derived from 18 predictive equations and an artificial neural network model. Analyses were performed for the total sample and body mass index (BMI) subgroups (<30 kg/m² and ≥30 kg/m²). eREE within ±10% of mREE was considered accurate; Bland–Altman plots were performed to evaluate agreement.
Results
In the BMI < 30 kg/m² subgroup [n = 115; 1372 ± 153 kcal (5744.3 ± 640.6 kJ)], mREE did not differ from four predictive equations; Henry [1371 ± 95 kcal (5740.1 ± 397.8 kJ), p = 0.922, bias −1.0 kcal (−4.2 kJ)] and Dietary Reference Intakes-Institute of Medicine [1382 ± 102 kcal (5786.2 ± 427.1 kJ), p = 0.315, bias 10.2 kcal (42.7 kJ)] equations showed better agreement and accurate prediction performance among BMI categories (79.1 and 82.6%, respectively). The BMI ≥ 30 kg/m² subgroup mREE [n = 111; 1516 ± 186 kcal (6347.2 ± 778.7 kJ)] was significantly lower than all predictive methods and had higher bias and over-prediction, except for Mifflin-St Jeor equation [1523 ± 186 kcal (6376.5 ± 778.7 kJ), p = 0.469, bias 7.7 kcal (32.2 kJ)].
Conclusion
Equations for estimating REE show wide performance variation, with limited accurate options in this population, especially among those with BMI > 30 kg/m².
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Data availability
The data presented in this study are available on request from the corresponding author.
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Acknowledgements
We are particularly thankful to Gabriela Sousa de Oliveira, Isabela Nogueira Martins Sena Rios, and Gustavo Neves de Souza Gomes for contributing to data collection.
Funding
This study was funded by the Foundation for Research Support of the Federal District (FAPDF; grant number 0193.001.462/2016), the Brazilian National Council for Scientific and Technological Development and the Ministry of Health (CNPq/MS; grant number 408340/2017-7). The authors RML and KMBC also thank CNPq (grant numbers 305746/2022-7 and 302740/2022-8) for the financial support.
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Conceptualization, FL and ESD; Formal analysis, FL; Funding acquisition, KMBC; Investigation, FL, FTV and MSMA; Methodology, FL, FTV, MSMA, RML, ESD and KMBC; Project administration, KMBC; Supervision, RML, ESD and KMBC; Writing – original draft, FL; Writing – review & editing, FL, FTV, MSMA, RML, ESD and KMBC.
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The study was conducted in accordance with the Declaration of Helsinki, and approved by the Research Ethics Committee of the Faculty of Health Sciences of the University of Brasília [protocol codes 2,052,734 (2017) and 3,595,291 (2018)]. Informed consent was obtained from all subjects involved in the study.
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Lamarca, F., T. Vieira, F., S. Melendez-Araújo, M. et al. Resting energy expenditure of females mid- to long-term after bariatric surgery: agreement between indirect calorimetry and predictive methods. Eur J Clin Nutr 79, 587–596 (2025). https://doi.org/10.1038/s41430-025-01577-2
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DOI: https://doi.org/10.1038/s41430-025-01577-2