This study includes a longitudinal mixed methods study of 360 YYA with diabetes in SC, CO, and WA conducted with SFS 1 participants. SFS 2 will have two parts: (1) an intense, longitudinal study consisting of two 14-day assessment periods spaced 9 months apart which will include CGM, EMA, accelerometry, and surveys in all participants (the EMA study); and (2) a concurrent events qualitative study with a subset of participants (30 T1D, 15 T2D) who will complete 13 one-on-one, semi-structured interviews throughout the 9-month assessment period (the qualitative study).

This study will involve taking one or two medications already approved by the Food and Drug Administration (FDA) for treatment of type 2 diabetes to learn more about which diabetes medications are the best for lowering the risk of heart and kidney disease in individuals with type 2 diabetes who are at least 40 years old. Participation includes about 8 study visits over a period of 72 months, which can be performed over the phone remotely or during normal standard of care clinic visits. Participants will be compensated for their time and participation in this research study.