RecruitingPhase 2Drug trialThe Gut Microbiome in Type 1 Diabetes and Mechanism of Metformin ActionOvwerweight and obesity prevalence in persons with T1D has increased, which further complicates management and risk for complications. The proposed study is relevant to public health because it helps us understand the role of the gut microbiome in disease pathophysiology in T1D youth with overweight and obesity as well as potential mechanisms to modify disease.