This patient support community is for questions related to juvenile diabetes including celiac disease, depression, diabetic complications, hyperglycemia / diabetic keto-acidosis, hypoglycemia, islet cell transplantation, nutritional issues, parenting a diabetic child, pregnancy, pump therapy, school issues, and teens with diabetes.
You're 100% right when you said "I could talk to my doc" cuz that's the safest, surest, and -- in the long run -- easiest approach. We do need carbos, we do need fats, we do need proteins, and we do need fiber/roughage. Most of us who need to shed some pounds have managed to create a lifestyle where we take on more calories than we burn.
With your doc, you can brainstorm on an overall fitness plan. Starting slowly, of course, perhaps an extra walk or two around the block if you've been sedentary for a while. Or perhaps something more active if you're ready. The key is always for us to balance our insulin and activity and food. And as we become more active, our metabolism tends to speed up, too -- making it easier to burn more calories.
The kicker is to avoid the yo-yo of ups 'n' downs. That yo-yo'ing actually makes each successive attempt at weight loss more difficult, cuz our bodies hoard the fat/weight to protect against another "famine."
Exercise is the weakest link in my overall DM management, so it helps me, too, to encourage you to increase your activity level. We're not physicians here, so our advice is coming only from personal experience and reading. If you like what you'll read here, chat with your doc about whether/how it could apply to your specifics.
Try to include plenty of whole grains such as 100% whole wheat bread, whole wheat pasta, brown rice, rolled oats, etc. Do a search for "glycemic index" and you'll get an idea of what to include in your diet, and what to avoid.
And start walking! As mentioned previously, this is something low impact activity that almost everyone can do or build slowly up to, and will have a wonderful effect on your fitness level and weight.