Abstract
Objectives
Resting energy expenditure (REE) declines more than what is expected according to body composition changes after caloric restriction. This metabolic adaptation is considered one of the factors favoring weight regain. The aim of this study is to evaluate the changes of REE and calculate the degree of metabolic adaptation occurring after laparoscopic sleeve gastrectomy (LSG).
Methods
REE (by indirect calorimetry) and body composition (fat-free mass or FFM, fat mass or FM by bioelectrical impedance analysis) were determined before and after 12 months in 154 patients with obesity treated with laparoscopic sleeve gastrectomy (LSG).
Results
Weight loss was 29.8 ± 10.6%, with corresponding relative reductions in FM (44.5 ± 22.8%), FFM (13.7 ± 9.9%), and REE (27.3 ± 12.9%). A predictive equation for REE was computed by using the baseline FFM and FM values to account for body composition changes. A predicted post-weight loss REE was calculated by using this equation and entering post-weight loss body composition values. Observed post-surgery REE was significantly lower than predicted one (1410 ± 312 vs 1611 ± 340 kcal/day, P < 0.001) and metabolic adaptation, calculated as the difference between observed and predicted post-weight loss REE, was − 199 ± 238 kcal/day. The post-surgery level of metabolic adaptation was inversely related to postoperative percent weight loss (r = − 0.170; P < 0.05) and FM loss (r = − 0.245; P < 0.01).
Conclusions
A significant reduction of resting energy expenditure and a significant degree of metabolic adaptation both occur after sleeve gastrectomy. A greater metabolic adaptation could be partly responsible for a lower weight loss after surgery.
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Funding
The study was conducted with the institutional funds of the Comprehensive Care Obesity Centre, University of Padua, and without external sources of financial support.
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SB and EB contributed equally to the preparation of this paper.
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Dr. Serra reports receiving personal fees from Pizeta Pharma and Astra Zeneca for his services as a speaker and scientific advisor. Dr. Fioretto reports receiving personal fees from Astra Zeneca, Boehringer Ingelheim-Lilly, and Janssen for her services as a speaker and scientific advisor. Dr. Busetto reports receiving personal fees from IntraPace, Pizeta Pharma, and Novo Nordisk for his services as a scientific advisor. Dr. Bettini, Dr. Belligoli, Dr. Bordigato, Dr. Fabris, Dr. Dal Pra’, Dr. Compagnin, Dr. Foletto, Dr. Prevedello, Dr. Sanna, and Dr. Vettor declare no conflict of interest.
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Informed consent was obtained from all individual participants included in the study.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Bettini, S., Bordigato, E., Fabris, R. et al. Modifications of Resting Energy Expenditure After Sleeve Gastrectomy. OBES SURG 28, 2481–2486 (2018). https://doi.org/10.1007/s11695-018-3190-3
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DOI: https://doi.org/10.1007/s11695-018-3190-3