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. Since salads are typically made of raw fruits and vegetables they can be more difficult to digest. And since you had bariatric surgery your ability to digest foods has changed and will take some time to adjust Longer term risks and complications of gastric bypass can include: Bowel obstruction. Dumping syndrome, causing diarrhea, nausea or vomiting