Abstract: This invention relates to a device comprising a display for displaying graphics, text and/or combinations thereof, a processor (230) that is interfaced with said display, wherein the processor is configured to cause the display to display in a diagram, which diagram comprises a time axis indicating time relative to a habitual meal of a diabetic patient and a second axis on which units of blood glucose values are indicated, the following items: a) an indication at the point of time of the habitual meal, b) a mean or a median value of pre meal blood glucose values and/or d) a set of pre meal blood glucose measurements, and c) a mean or a median value of post meal blood glucose values, and/or e) a set of post meal blood glucose measurements. It is an advantage that said displayed items can be used as a dialogue tool between the diabetic patient and a health care personal. Furthermore, said displayed items on the device can be used as an aid in self management of diabetes.