Inclusion Criteria:  Enrollment in a qualifying National DPP program Body mass index (BMI) ≥25 kg/m2 for non-Asians and ≥23 kg/m2 for Asians. Have prediabetes identified by either a blood test or a self-reported risk test or have a history of gestational diabetes mellitus (GDM).  Exclusion Criteria:  Participants cannot have a previous diagnosis of type 1 or type 2 diabetes, prior to enrollment in a National DPP.