If you enroll in the study, you will be randomized to receive semaglutide or placebo (dummy drug). The study is double-blinded, which means neither you nor the researchers will know which you are on. You have a 50% chance of receiving the active drug, semaglutide. Once you are randomized, the study involves taking a shot of the medication every week and monitoring your blood sugars. We will give you all the supplies you need for this study. At certain times during the study, you will wear a continuous glucose monitor, which is a small device that you can wear on your arm or your belly and reads your blood sugar every 5 minutes. The visits will often be by phone, but you will need to come into clinic at least four times during the study.