| Outcome Measures: |
Primary: Correlation between the total and intact GLP-1 hormone during different doses of sitagliptin measured as total area under the curve (tAUC), GLP.1 total and GLP-1 intact will be calculated based on blood samples at time points: -40,-30,-20,-10,0,10,20,30,40,50,60,75,90,105,120,150,180,240,300,360 on all days | Secondary: Differences in serum-/plasma concentrations of GLP-1 measured as total Area under the curve (tAUC), GLP-1 will be measured at time points(minutes): -40,-30,-20,-10,0,10,20,30,40,50,60,75,90,105,120,150,180,240,300,360 on all days|Differences in glucose measured as total Area under the curve (tAUC), Glucose will be measured at time points(minutes): -40,-30,-20,-10,0,10,20,30,40,50,60,75,90,105,120,150,180,240,300,360 on all days|Differences in Insulin measured as total Area under the curve (tAUC), Insulin will be measured at time points(minutes): -40,-30,-20,-10,0,10,20,30,40,50,60,75,90,105,120,150,180,240,300,360 on all days
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