[Double diabetes - a metabolic challenge]

In Northern Europe, we are used to classifying diabetes as either type 1 or type 2 (with some exceptions). These exceptions include secondary diabetes (e.g. gestational diabetes, after pancreatectomy, steroid therapy, etc.) and monogenic diabetes. However, the fact that one can actually suffer from (at least) two different types of diabetes, simultaneously or consecutively, is rarely discussed. This article describes a case of monogenic diabetes with autoantibodies against the β-cell antigen GAD-65. The existence, and implications, of other constellations of »double diabetes« are discussed.