This article provides an overview of the prevalence of type 2 diabetes and the antidiabetic treatment over a 17 year study period. The causes of the disease and the impact of diabetes on cardiovascular disease (CVD) morbidity are discussed. Furthermore, changes in lifestyle and risk factor profile in persons with diabetes are reported. We present data from the MONICA/KORA surveys S1-S4 conducted between 1984/85 and 1999/2001 in the region of Augsburg, Southern Germany and the Augsburg Myocardial Infarction Registry. Contrary to most studies from other countries, in the 25 to 74 year old Augsburg population the prevalence of known diabetes did not increase over the last years. Obesity and decreased physical activity are the two main lifestyle related risk factors for type 2 diabetes. Recently, further modifiable risk factors such as smoking and hypertension have been associated with the development of type 2 diabetes in the Augsburg population. Consistent with recommendations to intensify glucose control in diabetic persons the diabetes treatment continuously improved during the study period. However, health status of persons with diabetes is far from optimal in the Augsburg population suggesting that recommendations for primary prevention of CVD in diabetic persons were not sufficiently put into practice until 1999/2001. Furthermore, data from the MONICA/KORA Augsburg Myocardial infarction registry underline the challenge that in particular men and women with diabetes should receive intensive preventive interventions proven to reduce CVD risk. In conclusion, data from the MONICA/KORA Augsburg studies suggest that it should become an important public health priority to prevent diabetes mellitus.