Hmmmm. I've been struggling with IBS for years. When I was thin it was a problem, too. Since getting my balloon I've had some of the worst IBS issues ever. Though (fingers crossed), I've been virtually symptom free for the last 5 weeks after having an intestinal parasite. I hate dealing with IBS, it's embarrassing and uncomfortable at the best of times. I don't think my weight has affected it positively or negatively over the years.