Metabolic & Cardiometabolic
gastric bypass (RYGB) increases alcohol use disorder risk
In plain terms: Does gastric bypass increase alcohol use disorder risk?
Strong support Metabolic & Cardiometabolic 🔬 Includes disconfirming
Part of: 🩺 bariatric / metabolic surgery
RefutedContestedStrong support
consensus score 0.89
Yes—RYGB (more than sleeve) raises new-onset AUD risk, with altered ethanol pharmacokinetics, higher AUD prevalence, and elevated alcohol-related liver disease/mortality.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
12 support 0 contradict 1 tested null 1 mixed · 14 sources, 12 independent groups
What the evidence shows
Gastric bypass raises the risk of new alcohol use disorder, more than sleeve gastrectomy does. In the LABS-2 cohort, prevalence rose from 7.6 percent in the first post-operative year to 9.6 percent in the second, concentrated after bypass, and altered ethanol pharmacokinetics give it a mechanism. Observational evidence, but consistent across independent cohorts.
The evidence (19)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Williams TJ, Palmer AJ, Connor JP, Holtmann G, Clark PJ 2026 · Addiction (Abingdon, England) | observational | supports | low | Retrospective cohort, n=30 (20 sleeve gastrectomy, 10 RYGB) among patients seeking alcohol-problem treatment; mean AUDIT rose from 10.2 to 18.1 post-surgery (p<0.001), alcohol-dependence cases rose from 9 to 29 of 30. |
| Fakhoury B, Sierra L, Rama K, Jahagirdar V, Díaz LA, Arab JP 2025 · JAMA Netw Open | observational | tested-null | moderate | Confirms elevated post-bariatric AUD risk; incretin therapies may attenuate it—reinforces surgery-specific signal. |
| Sharpe E, Frings D, Wood K 2026 · International journal of qualitative studies on health and well-being | observational | supports | low | Qualitative study, semi-structured interviews with 11 UK women (post-bariatric, mostly RYGB) who developed problematic alcohol use without formal AUD diagnosis; identifies altered ethanol metabolism plus psychosocial drivers (identity chang |
| Scheen AJ 2025 · Diabetes Metab | observational | supports | moderate | Review: bariatric surgery increases addiction/AUD risk (contrasting reduced risk with GLP-1 RAs). |
| Riedel O, Braitmaier M, Dankhoff M, Haug U, Klein M, Zachariassen W, Hoyer J 2024 · Int J Obes | observational | supports | moderate | Linked claims+survey data: elevated AUD rates after bariatric surgery confirmed in an independent German cohort. |
| Leggio L, Farokhnia M, Kenny PJ, Pepino MY, Simmons WK 2025 · Molecular psychiatry | observational | supports | low | Non-systematic critical review of AUD-obesity crosstalk; states 'growing evidence of changes in alcohol drinking in people who undergo bariatric surgery for obesity' and reviews mechanisms (GLP-1, gut-brain axis) linking bariatric surgery t |
| King WC, Chen JY, Mitchell JE, Kalarchian MA, Steffen KJ, Engel SG, Courcoulas AP, Pories WJ, Yanovski SZ 2012 · JAMA | observational | supports | high | LABS-2 landmark: AUD prevalence rose from 7.6% (yr1) to 9.6% (yr2) post-op; increase concentrated after RYGB. |
| Sjöholm K, Peltonen M, Jacobson P, Andersson-Assarsson JC, Ahlin S, Adméus L, Arnetorp I, Engström M, Taube M, Carlsson LMS, Svensson PA 2025 · Br J Surg | observational | supports | high | SOS up to 35yr: bariatric surgery associated with higher AUD incidence and increased alcohol-related mortality. |
| van Reekum EA, Darcy M, Drage J, Xu J, Ng K, Forestell B, Santesso N, Joundi RA, Wong J, Doumouras A, Taylor VH, Yusuf S, Van Lieshout R 2025 · Obesity reviews : an official journal of the International Association for the Study of Obesity | meta-analysis | supports | moderate | Systematic review and meta-analysis, 79 studies (75 NRS, 4 RCTs), 732,149 MBS patients vs 7,670,770 non-surgical controls; MBS associated with 4/100 more substance use disorders (low certainty) beyond 2 years post-surgery, alongside slightl |
| Nazmin F, Modi PU, Akter S, Chowdhury F, Rahman MS, Gadde R 2025 · Cureus | observational | supports | low | Systematic review (PRISMA) of 12 studies (2013-2024) on nutritional status of bariatric patients with AUD; reports 'higher incidence of AUD after bariatric surgery, especially after sleeve gastrectomy or RYGB' with elevated alcohol sensitiv |
| Adeniran O, Nieto LM, Amadi C, Shepherd K, Kirkpatrick J, Farah K, Marwizi F, Alqinai B, Narvaez SI, Mensah S, Adekolu A, Cohen EM, Khan RS, Gayam S, Tabone LE, Davisson L 2025 · Obesity (Silver Spring) | observational | supports | moderate | Multicenter RYGB cohort: RYGB linked to increased alcohol-related outcomes; independent confirmation of the RYGB signal. |
| Ibrahim A, Rockey DC 2025 · Clin Obes | observational | supports | high | PSM (15,808 pairs): post-bariatric AUD patients had higher alcohol-hepatitis (OR 1.67), cirrhosis (OR 1.49), mortality (OR 1.13). |
| Strømmen M, Bakken IJ, Sandvik J, Bramness JG, Klöckner C 2026 · Int J Obes | observational | mixed | moderate | Nationwide registry found gastric bypass carried higher alcohol use disorder rates than sleeve gastrectomy, supporting a procedure-specific (RYGB) risk. |
| Nazmin F, Gunturu S, Jaka S, Rahman S 2025 · Actas espanolas de psiquiatria | observational | supports | low | Narrative review (PRISMA-guided search, 11 studies, 2013-present) on AUD incidence after bariatric surgery; found elevated risk especially after sleeve gastrectomy or RYGB, with increased alcohol sensitivity and earlier symptom onset. |
| Cheloff AZ, Young S, Kim L, Wander P, Castaneda D, Popov V 2026 · Surg Obes Relat Dis | meta-analysis | supports | moderate | Systematic review and meta-analysis found meaningful rates of de novo alcohol use disorder and high-risk drinking after RYGB and sleeve gastrectomy. |
| Er E, Etienne AM, Flahault C, Quertemont E 2026 · Surg Obes Relat Dis | observational | supports | moderate | Prospective cohort: alcohol use and drinking motives increase early after bariatric surgery. |
| Mahmud N, Panchal S, Abu-Gazala S, Serper M, Lewis JD, Kaplan DE 2023 · JAMA Surg | observational | supports | high | Veterans Affairs cohort controlling for BMI and alcohol-use trajectory found RYGB associated with increased alcohol-related hospitalization and mortality. |
| Strømmen M, Dale O, Klöckner C, Tylleskär I 2026 · International journal of obesity (2005) | observational | supports | moderate | Prospective non-randomized study, n=33 (RYGB=14, SG=19), no baseline AUD; oral/IV ethanol challenge pre-op and at 3/12/36 months. Both procedures roughly doubled ethanol Cmax and AUC and halved Tmax, more pronounced after RYGB, authors conc |
| Campuzano-Donoso M, Reytor-González C, Sarno G, Montalvan M, Barrea L, Muscogiuri G, Verde L, Annunziata G, Simancas-Racines D 2026 · Nutrients | observational | supports | low | Narrative review synthesizing epidemiological, pharmacokinetic and neurobiological drivers of postoperative AUD/SUD; describes RYGB eliminating ethanol first-pass metabolism and accelerating absorption, creating a 'reward gap' that raises A |
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