In this clinical study, we want to examine the effects of different fasting periods (12 hours versus 36 hours) on blood sugar levels and other metabolic parameters and hormones. For this the following investigations are carried out:
* Oral glucose tolerance test with detailed laboratory evaluation
* Bio-impedance measurement to determine body composition (muscle and fat mass)
The examinations are carried out on 4 different cohorts (normal healthy persons, obese patients, patients with type 2 diabetes and patients with type 1 diabetes).
