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Evolution of the basal metabolic rate after Roux-en-Y gastric bypass: a systematic review and meta-analysis

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Abstract

Patients who undergo Roux-en-Y gastric bypass (RYGB) exhibit a reduction in total basal metabolic rate (BMR) after surgery, which seems to be intimately related to the amount of postoperative weight loss. The objective was to perform a systematic review and meta-analysis of the literature to determine and evaluate BMR changes after RYGB. The search was performed in certified databases, and the strategy was structured according to the PRISMA ScR. The quality evaluation of the articles included in this review was assessed with two different bias risk tools (ROBINS-I and NIH) according to each study design. Two meta-analyses were elaborated based on the results. 163 articles were selected (from 2016 to 2020), and 9 articles met the inclusion criteria. All of the selected studies evaluated only adult patients, mostly women. Postoperative BMR diminished in all of the included studies after surgery compared to preoperative values. The follow-up periods were 6, 12, 24 and 36 months. Eight articles were used for the meta-analysis after the quality assessment, a total of 434 participants. Compared to baseline values, mean postoperative reductions of 356.66 kcal/d after 6 months (p < 0.001) and 432.89 kcal/d (p < 0.001) after 1 year were observed. The BMR decreases during the first years after Roux-en-Y gastric bypass, especially during the first year postsurgery.

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Abbreviations

BMI:

Body mass index

BMR:

Basal metabolic rate

RYGB:

Roux-en-Y gastric bypass

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Authors and Affiliations

  1. Universidade Federal do Paraná (UFPR), Rua General Carneiro, 181, Centro, Curitiba, PR, Brazil

    Michelle T. F. Reichmann, Alexia Duarte & Antonio Carlos L. Campos

  2. Pontifícia Universidade Católica do Paraná (PUCPR), Rua Imaculada Conceição, 1155, Curitiba, PR, Brazil

    Flavio Ivano

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Reichmann, M.T.F., Duarte, A., Ivano, F. et al. Evolution of the basal metabolic rate after Roux-en-Y gastric bypass: a systematic review and meta-analysis. Updates Surg 75, 1083–1091 (2023). https://doi.org/10.1007/s13304-023-01523-6

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