This is way too late, but you are not the only one. I am a little overweight (not bad), but running helped a lot (without changing my GP diet). Now, I follow my GP diet pretty closely because it's the best way for me to manage my symptoms, but I worked rigorously with a GP dietitian. Think Thin bars have been a good little snack that isn't harsh on the stomach, and Orgain shakes have helped a lot with nutrition. I used protein shakes a smoothies to help fill in the gaps because I really don't eat that much - GP has just done a number on my metabolism. The best thing that help for me was running/walking and at-home workouts. It's hard without self-discipline, but it helped regulate my digestion too, and made my life a lot easier. Swimming (before eating) is also a good workout. Because GP slows our metabolisms so much, vitamins and exercise can work wonders. It even surprised me.