Bread, Rice, and Pasta - Because of the starchy nature of bread, rice, and pasta, after your surgery, they can form a paste in your throat that is hard to swallow without liquid. In some cases, they can block the stoma, the hole to the pouch that is your new stomach. Currently, bariatric surgery is the most effective treatment for severe obesity and its metabolic complications; however, 15–35% of the patients that undergo bariatric surgery do not reach their goal for weight loss Longer term risks and complications of gastric bypass can include: Bowel obstruction. Dumping syndrome, causing diarrhea, nausea or vomiting On average, a mini gastric bypass surgery can take about 45 minutes to an hour to perform, however keep in mind that it will differ according to each patient and surgeon Over the first three months, patients can expect to lose about 33 percent of their excess weight. Six months post-surgery, patients can anticipate shedding half their extra weight.