How Long After Bariatric Surgery Can I Drink Alcohol?
We found no official NIH or NIDDK page that sets a date. Your surgical team decides. An NIH-hosted study found that one year after gastric bypass, alcohol reached a higher peak blood level in about 7 minutes instead of about 43, so drinking is riskier after this surgery.
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The NIDDK weight-loss surgery page we read does not mention alcohol, and we found no NIH or NIAAA page giving a number of weeks or months. Follow the written instructions from your surgeon and dietitian, since they know which operation you had.
What gastric bypass changes
A study in Surgery for Obesity and Related Diseases (funded in part by NIAAA, hosted by the National Library of Medicine) gave 34 people the same dose of alcohol before and one year after Roux-en-Y gastric bypass.
- Peak blood alcohol rose from 0.0646 mg/ml to 0.1010 mg/ml.
- Time to the peak fell from about 42.6 minutes to about 6.8 minutes.
- Reported reward from alcohol rose, which the authors link to a possible higher risk of alcohol use disorder.
The study did not test sleeve gastrectomy, and the authors say the results cannot be applied to other procedures. It was a small lab study and does not prove cause.
Practical points
- Ask your team in writing what applies to your operation and your medicines.
- If alcohol feels much stronger than before, treat that as a warning and tell your team.
Compare drink sizes with our standard drink calculator. This is general information, not medical advice.
People also ask
Is there an official waiting period before drinking after weight-loss surgery?
We found none on NIH or NIDDK pages. Your surgical team sets it for your operation.
Does alcohol hit harder after gastric bypass?
In one study of 34 people, peak blood alcohol was higher and came much sooner one year after gastric bypass.
Does this apply to gastric sleeve?
The study did not test sleeve surgery, and its authors say results cannot be generalized to other procedures.
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