Others believe that it's all right to add extra insulin if eating larger amounts. This can be very risky, so it's essential to discuss it with your health care team first. Once I start taking insulin, I'll gain a lot of weight. This can make it very easy to maintain or lose weight, but it's not healthy. Once you start using insulin and your blood glucose levels are in good control, your body uses food better.
Sugar is used as energy or stored as fat, and it's no longer lost in the urine.
For this reason, there may be an initial weight gain, perhaps 3 to 5 pounds, when someone in poor control goes on insulin. On the other hand, many people with high blood glucose levels have an increased appetite and overeat. Once insulin is started and blood glucose levels improve, the hunger subsides. Then, with proper diet, you can control your weight and avoid weight gain. If this happens frequently, you may gain weight.