Among adults who have undergone bariatric surgery, the prevalence of alcohol use disorder appears to be greater in the second year after surgery (9.6%) than in the first year after the procedure (7.3%) and the year prior to surgery (7.6%). The following were independently related to increased odds of post-bariatric surgery alcohol use disorders:

Male gender and younger age.
Regular alcohol consumption.
Recreational drug use.

A lower sense of belonging and having undergone a Roux-en-Y gastric bypass procedure also increased the odds of alcohol use disorders after surgery.

Abstract: JAMA , June 20, 2012.