Abstract
The effect of bariatric surgery on resting energy expenditure (REE) remains unclear, particularly in terms of the REE/fat-free mass (FFM) ratio. We performed a systematic review with a meta-analysis on Roux-en-Y gastric bypass (RYGB) studies to investigate the effect of bariatric surgery on the REE/FFM ratio 6 and 12 months postoperatively. Five of the 13 records of 6-month data (n = 406) showed a reduction in the REE/FFM ratio without significant summary effects. As regards 12-month data (10 records, n = 713), there was a significant relative REE mean reduction of 1.95 kcal/kg in FFM (CI: −2.82 to −1.09; I2 = 28%; p < 0.00001). These findings suggest that bariatric surgery, specifically RYGB, leads to a decrease in the REE/FFM ratio during the first postoperative year, which may compromise long-term treatment outcomes.




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Acknowledgments
We are particularly thankful to Ananda Araújo, Larissa Valadares, Roberta Borges, and Vivian S.S. Gonçalves for reviewing the manuscript based on the Peer Review of Electronic Search Strategies (PRESS) guidelines.
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Fernando Lamarca, Eliane Said Dutra and Kênia Mara Baiocchi de Carvalho wrote the protocol and designed the study. Fernando Lamarca and Mariana Silva Melendez Araújo conducted literature searches, study selection, data collection, data analysis, and manuscript preparation. Isabela Porto de Toledo contributed to literature searches, data analysis, and figure and table conception. All authors reviewed the manuscript and approved the version to be submitted.
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Lamarca, F., Melendez-Araújo, M.S., Porto de Toledo, I. et al. Relative Energy Expenditure Decreases during the First Year after Bariatric Surgery: A Systematic Review and Meta-Analysis. OBES SURG 29, 2648–2659 (2019). https://doi.org/10.1007/s11695-019-03934-0
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DOI: https://doi.org/10.1007/s11695-019-03934-0