La maturi de obicei se stabileşte diagnosticul de diabet de tip 2. Din anii 1980, subiecţii cu diabet de tip 2, care nu răspund la tratamentul cu sulfanilureice sunt consideraţi ca pacienţi cu diabet de tip 1 lent progresiv. Actualmente acest subtip este considerat diabet autoimun cu evoluţie lentă la maturi (LADA).

An adult presenting with diabetes is usually assumed to have type 2 diabetes. Since the 1980, type 2 diabetic subjects who had failed sulfonylurea therapy soon after diagnosis have been thought to be actually slowly progressive type 1 patients. This diabetes sub-type is currently referred to as latent autoimmune diabetes in adults (LADA).