Hello! I have tried everything under the sun to lose with, like WW, Nutrisystem, Jenny Craig, etc and I've had some success with all of the programs. Each have their positives and negatives. I really like Weight Watchers since you are held accountable every week by having come to come in for class/weigh in. Also, they teach you basic nutrition principles/tips that you can use in everyday life. You will need to keep a watch on your insulin since you may be eating less/more than you previously were. Make sure to check your glucose often to prevent any lows. As we all know, weight loss and type 1 diabetes aren't the best match in the world. But, if you can monitor your sugars while watching portions/calories and exercising, I feel as if weight loss with diabetes is possible! In terms of exercise, depending on what type of activity you are doing, you may need to put a temporary basal on. I usually check my sugar about 1 hour before I exercise to gauge what to do with my pump. I will usually start a temporary basal around 50%-75% for 1 hour before I workout. Then, when I get to the gym, I will either suspend my pump (depending on what my glucose is) or I will start another 30-50% temporary basal for 1 hour. Unfortuently, one thing that works for me may not work for you. Therefore, this is a trial and error process. Make sure to have glucose tabs and granola bars on hand to handle a low. I'm starting to train to run a half marathon so lately I've been drinking gaterade and water while I workout in order to maintain a normal glucose level. Hope that helps, good luck!