In other words, the body is not able to properly use the insulin that it makes which causes the blood sugar to go too high. Weight loss can improve insulin resistance therefor improve blood sugar control. Exercise has a similar benefit in improving insulin resistance. Weight loss and exercise are the cornerstone to treating type 2 diabetes. I have type 2 diabetes and control my blood sugar with diet and exercise.
Exercise does burn glucose from the blood and can lower the blood sugar.
Besides, many people exercise to help with weight loss, and if you snack you will be burning the fuel from your snack, which means you wont be lowering your blood sugar or burn much body fat. A recent study called the United Kingdom Prospective Diabetes Study showed that blood pressure control and blood sugar control were both very important in preventing complications associated with diabetes. If you have high blood pressure you may need medication to control it. Insulin can be stored at room temperature. Any change of insulin should be made only under medical supervision.