This is something you should definitely talk to your doctor about. Some doctors do recommend that their patients not drink alcohol after gastric bypass surgery. That's because it appears your body may metabolize alcohol differently and that alcohol may actually get into your system more quickly. In addition, a recent study showed a link between gastric bypass surgery and alcohol problems after surgery. That doesn't mean the surgery will make you an alcoholic. We don't fully understand the link at this point but it's something to be aware of.
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