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Updated: Jul 11, 2026
07:37
Roux-en-Y Gastric Bypass Operation in Rats
Published on: June 11, 2012
Does gastric bypass alter alcohol metabolism?
Judith C Hagedorn1, Betsy Encarnacion, Gabriel A Brat
1Department of Surgery, Stanford School of Medicine, Stanford, California 94305, USA.
Summary
Gastric bypass surgery alters alcohol metabolism, leading to higher peak blood alcohol levels and slower normalization in patients. Bariatric surgery patients should exercise caution when consuming alcohol.
Area of Science:
- Bariatric Surgery
- Gastroenterology
- Pharmacology
Background:
- Morbid obesity presents a significant public health challenge in the U.S.
- Bariatric surgery is the most effective long-term treatment for morbid obesity.
- Concerns exist regarding altered alcohol metabolism post-gastric bypass surgery.
Purpose of the Study:
- To investigate and compare alcohol metabolism in post-gastric bypass patients versus control subjects.
- To test the hypothesis that alcohol metabolism is altered after gastric bypass surgery.
Main Methods:
- 36 participants (19 post-gastric bypass, 17 controls) consumed 5 oz of red wine.
- Alcohol breath analysis was conducted every 5 minutes for each participant.
- Outcomes included peak alcohol breath level and time for levels to normalize.
Main Results:
- Gastric bypass patients exhibited a higher average peak alcohol breath level (0.08%) compared to controls (0.05%).
- The time for alcohol breath levels to normalize was significantly longer in the gastric bypass group (108 minutes) versus controls (72 minutes).
- Despite altered metabolism, both groups reported similar postingestion symptoms.
Conclusions:
- Alcohol metabolism differs significantly between post-gastric bypass patients and controls.
- Gastric bypass patients experience elevated peak alcohol levels and prolonged alcohol clearance.
- Findings suggest caution regarding alcohol consumption for individuals who have undergone gastric bypass surgery.
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