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Review
. 2010 Apr;110(4):571-84.
doi: 10.1016/j.jada.2009.12.023.

Changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass procedure: a review

Lauren M Beckman  1 , Tiffany R Beckman, Carrie P Earthman
Affiliations
Review

Changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass procedure: a review

Lauren M Beckman et al. J Am Diet Assoc. 2010 Apr.

Abstract

Roux-en-Y gastric bypass is a well-accepted tool for the treatment of obesity and, compared to conventional weight loss methods (eg, diet and exercise) and other weight loss surgeries (eg, gastric banding), it results in considerable weight loss that is maintained long term. Although successful, the mechanisms for weight loss are not completely understood and it is thought that gastrointestinal hormones play a role. Several gastrointestinal hormones have been identified for their effects on appetite, including glucagon-like peptide-1 (GLP-1), peptide tyrosine-tyrosine (PYY), leptin, and ghrelin. This review encompasses a literature search that included 45 primary articles and shows that there are alterations in GLP-1, PYY, leptin, and ghrelin postoperatively. GLP-1 and PYY concentrations were usually found to be higher, whereas ghrelin levels were typically lower post- Roux-en-Y gastric bypass than in individuals with obesity, those who were overweight or of normal weight, and in those who underwent procedures other than Roux-en-Y gastric bypass or who achieved weight loss by lifestyle modification. An understanding of how gastrointestinal hormones change after Roux-en-Y gastric bypass may help dietetics practitioners optimize nutrition care for this patient population. A review of the literature also highlighted some research gaps that should be taken into consideration when designing future studies.

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Conflict of interest statement

STATEMENT OF POTENTIAL CONFLICT OF INTEREST: No potential conflict of interest was reported by the authors.

Figures

Figure 1
Figure 1
Overview of hormones. NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
Figure 2
Figure 2
Summary of research reviewed in a study of changes in gastrointestinal hormones and leptin after Roux-en-Y gastric bypass (RYGB). NOTE: Information from this figure is available online at www.adajournal.org as part of a PowerPoint presentation.
See this image and copyright information in PMC

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