Metabolic & Cardiometabolic
gastric bypass (RYGB) increases alcohol use disorder risk
In plain terms: Does gastric bypass increase alcohol use disorder risk?
Part of: 🩺 bariatric / metabolic surgery
Yes—RYGB (more than sleeve) raises new-onset AUD risk, with altered ethanol pharmacokinetics, higher AUD prevalence, and elevated alcohol-related liver disease/mortality.
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)
How the studies fall
The evidence (11)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Fakhoury 2025 · JAMA Netw Open | observational | supports | moderate | Confirms elevated post-bariatric AUD risk; incretin therapies may attenuate it—reinforces surgery-specific signal. |
| Scheen 2025 · Diabetes Metab | observational | supports | moderate | Review: bariatric surgery increases addiction/AUD risk (contrasting reduced risk with GLP-1 RAs). |
| Riedel 2024 · Int J Obes | observational | supports | moderate | Linked claims+survey data: elevated AUD rates after bariatric surgery confirmed in an independent German cohort. |
| King 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. |
| Sjoholm 2025 · Br J Surg | observational | supports | high | SOS up to 35yr: bariatric surgery associated with higher AUD incidence and increased alcohol-related mortality. |
| Adeniran 2025 · Obesity (Silver Spring) | observational | supports | moderate | Multicenter RYGB cohort: RYGB linked to increased alcohol-related outcomes; independent confirmation of the RYGB signal. |
| Ibrahim 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 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. |
| Cheloff 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 2026 · Surg Obes Relat Dis | observational | supports | moderate | Prospective cohort: alcohol use and drinking motives increase early after bariatric surgery. |
| Mahmud 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. |
Disagree, or know a study we missed?
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.