A multiethnic prospective cohort study has shown women with gestational diabetes, especially those over 35 years, of Māori ethnicity, or with socioeconomic deprivation, have a higher risk of type 2 diabetes compared with those with impaired glucose tolerance. The study assessed type 2 diabetes incidence over 25 years using data from a primary care dataset linked with multiple health registries. Results showed that the first 5 years post-partum are a critical window for intervention. Personalised post-gestational diabetes interventions that consider age, ethnicity, and socioeconomic status are needed to reduce the incidence of type 2 diabetes, the study authors concluded.