Insulinotropic Effect of GIP and GLP-1 Before and After Reduced Glucose Tolerance

Insulinotropic Effect of GIP and GLP-1 Before and After Reduced Glucose Induced by Steroid Treatment, Relative Physical Inactivity and High Calorie Diet

The incretin effect in patients with type two diabetes is reduced. The investigators have previously shown that it is possible to induce a defect in the incretin effect in healthy individuals. The purpose of this study is to evaluate the insulinotropic affect of the incretin hormones in healthy individuals before and after a deterioration of the glucose homeostasis.

The incretin effect in patients with type two diabetes is reduced. The investigators have previously shown that it is possible to induce a defect in the incretin effect in healthy individuals. The purpose of this study is to evaluate the insulinotropic affect of the incretin hormones in healthy individuals before and after a deterioration of the glucose homeostasis. The evaluation is done by infusing GIP, GLP-1 or saline during hyperglycemic clamps.

Inclusion Criteria:

• Caucasians without type 2 diabetes mellitus
• Normal OGTT (75 g of glucose) according to WHO's criteria
• BMI 20-30
• Hemoglobin > 8.0 mmol/l
• Informed consent

Exclusion Criteria:

• Liver disease (ALAT > 2 x normal level)
• Nephropathy (s-creatinin > 130 µM or albuminuria)
• Relatives (parents/siblings) with T2DM
• Medical treatment witch cannot be stopped for 12 hours