In the majority of cases, when a patient is having a significant “gas problem,” a close investigation of the diet usually identifies the condition. The most frequent culprit is carbohydrates (breads, pasta, etc.). Special attention should also be given to Gluten in other food products. Carbonation should also be avoided. Other less obvious contributing factors may include artificial sweeteners (Splenda). Milk-Lactose can also cause significant gas. If the dietary sources of the “gas problem” have been eliminated, probiotics should then be considered. There is very little published scientific data on this subject that I am aware of. Wasserberg et.al, from The University of Southern California in 2008, published “Bowel Habits after Gastric Bypass Versus the Duodenal Switch Operation”. They concluded: “…Although duodenal switch is associated with more bowel episodes than gastric bypass, the difference is not statistically significant. Bowel habits are similar in patients who achieve 50% estimated body weight loss with duodenal switch surgery or gastric bypass.”