The remaining portion of the stomach is excluded. My doctor has advised me not to have this surgery because everyone he knows who has had it has some type of unpleasant side effect they have to live with for the rest of their lives. While patients are learning and adapting to their new condition, they may experience nausea and vomiting. This generally resolves a few weeks after surgery. Some patients may experience transient constipation.
Diarrhea is extremely rare.
After gastric bypass, patients can tolerate a wide variety of healthy foods. My patients seem to be in general very happy with their result. The vertical banded gastroplasty, however, may have a slightly higher risk of side effects, particularly vomiting. In this operation, a tight band is placed around the stomach allowing only liquid and soft foods to pass through. Therefore, many patients have difficulty consuming solid food after this procedure and therefore will have frequent vomiting episodes.