If you have type 1 diabetes, your pancreas doesn't make insulin or makes very little insulin. Insulin is a hormone that helps blood sugar enter the cells in your body where it can be used for energy. Without insulin, blood sugar can't get into cells and builds up in the bloodstream
If you're overweight or obese, you will need to create an effective diet and exercise plan with your diabetes healthcare team. Being overweight or obese puts added pressure on the body's ability to properly use insulin to control blood sugar levels.