I never knew that Type 1s even had issues with weight until I joined a Type 1 Support Group in the past few months who now has 10,000+ members. I've seen a few of them mention issues with weight. I have heard that it helps with Type 2, and I'd think that with weight loss, insulin requirements for either type would decrease. I currently have a Type 2 diabetic who asked for my advice on doing it. I told him I wouldn't recommend it if he's able to lose weight by diet and exercise due to the risks involved during surgery, and the issues with nutrient absorption issue that people have. If you can't lose any weight, or you're morbidly obese and your life is high risk without it, I'd definitely recommend it, but short of that, I don't feel comfortable with recommending it. I'm curious to hear about this from others who do have experience with it!