Mechanism Underlying the Weight Loss and Complications of Roux-en-Y Gastric Bypass. Review
Open accessAbstract
Various bariatric surgical procedures are effective at improving health in patients with obesity associated co-morbidities, but the aim of this review is to specifically describe the mechanisms through which Roux-en-Y gastric bypass (RYGB) surgery enables weight loss for obese patients using observations from both human and animal studies. Perhaps most but not all clinicians would agree that the beneficial effects outweigh the harm of RYGB; however, the mechanisms for both the beneficial and deleterious (for example postprandial hypoglycaemia, vitamin deficiency and bone loss) effects are ill understood. The exaggerated release of the satiety gut hormones, such as GLP-1 and PYY, with their central and peripheral effects on food intake has given new insight into the physiological changes that happen after surgery. The initial enthusiasm after the discovery of the role of the gut hormones following RYGB may need to be tempered as the magnitude of the effects of these hormonal responses on weight loss may have been overestimated. The physiological changes after RYGB are unlikely to be due to a single hormone, or single mechanism, but most likely involve complex gut-brain signalling. Understanding the mechanisms involved with the beneficial and deleterious effects of RYGB will speed up the development of effective, cheaper and safer surgical and non-surgical treatments for obesity.
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Treatment of T2D and obesity with metabolic surgery, which results in increased GLP-1 secretion, has been associated with an increased risk of suicide and self-harm.
“treatment of T2D and obesity with metabolic surgery, which results in increased GLP-1 secretion (98), has been associated with an increased risk of suicide and self-harm (99)”
From The science of safety: adverse effects of GLP-1 receptor agonists as glucose-lowering and obesity medications (2026) · cites this paper as [98]
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Yoyo Dieting, Post-Obesity Weight Loss, and Their Relationship with Gut Health
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A New Physiologic Mouse Model of One Anastomosis Gastric Bypass
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- Authors
- Abdeen, G., & le Roux, C.
- Affiliations
- Imperial College London (GB)
- Corresponding author
- Abdeen, G
- ORCID
- Abdeen, G
- Venue
- Obesity Surgery
- Published
- 2015-11-03
- Volume
- 26
- Issue
- 2
- Pages
- 410-421
- ISSN
- 0960-8923 (ISSN-L)
- 1708-0428
- PMC
- PMC4709370
- OpenAlex
- W1900993947
- Cited by
- 162
- References
- 212
- Citations by year
- 2026: 8 · 2025: 10 · 2024: 11 · 2023: 15 · 2022: 22 · 2021: 23 · 2020: 18 · 2019: 11 · 2018: 15 · 2017: 20 · 2016: 9
- FWCI
- 2.81
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Obesity Surgery (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Spiral (Imperial College London) (submittedVersion, cc-by)
- Topics
- Health Sciences › Medicine › Surgery › Bariatric Surgery and Outcomes
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Pharmacology › Pharmacology and Obesity Treatment
- Keywords
- Roux-en-Y gastric bypass, bariatric surgery
- MeSH terms
- Animals, Eating, Gastrointestinal Hormones, Humans, Obesity, Gastric Bypass, Weight Loss
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