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.
Longer term risks and complications of gastric bypass can include: Bowel obstruction. Dumping syndrome, causing diarrhea, nausea or vomiting The primary difference between mini gastric bypass surgery and a full gastric bypass is that the mini version of the surgery is performed in a modified manner that involves less intestinal rerouting and a shorter overall surgery time.