RecruitingPhase 1Drug trialA Study of Tirzepatide (LY3298176) in Participants With Type 1 Diabetes Mellitus and Overweight or ObesityThe main purpose of this study is to learn more how tirzepatide affects stomach emptying in participants with Type 1 Diabetes Mellitus (T1DM) and overweight or obesity. Participation in this study will last about 8 weeks, including screening and follow-up.