Glycemic Variability in Intermittent Fasting

Inclusion Criteria: * Body Mass Index in the range between 18.5 and 29.9 kg/m\^2 * stable sleep pattern (going to bed between 21:30h and midnight) * for women: regular menstrual cycle lasting between 21 and 35 days, with average bleeding time 2 to 6 days Exclusion Criteria: * Body Mass Index below 18.5 or above 29.9 kg/m\^2 * irregular sleeping pattern * work in nightshift * high intensity workout routine * irregular dietary patterns (e.g. skipping meals) * regularly fasting for more than 15 hours per day * diagnosis of diabetes (or other conditions related to glycemic disorders) * hypertension or other cardiovascular disease * neurologic conditions * disease affecting metabolism (like liver, kidney, thyroid or lung) * use of medications for glycemia, hypertension, steroids, adrenergic stimulators, laxatives or supplements affecting glycemia, circadian rhythm, sleep or metabolism in general