Longitudinal Monitoring During Intermittent Fasting Protocols in Obese Adults

Inclusion Criteria: * Age between 18-50 years, both inclusive * Obese, BMI between 30 and 40 kg/m\^2 (obesity grade I or II), both inclusive * Non-smoker * Good knowledge of German or English language * Stable weight change (change \< +/- 3% current bodyweight) for 3 months prior to the study * HbA1c \< 6.5% without glucose lowering medication * LDL-cholesterol \< 4.6mmol/l without lipid lowering medication Exclusion Criteria: * Participants who have a fasting period of \> 12h per day on a regular basis and do not eat at least three main meals per day. * Current habitual use of dietary supplements (e.g., vitamins, minerals) and/or unwillingness to cease intake of dietary supplements. * Antibiotics intake during 3 months prior to the study due to possible interference with metabolic parameters * Food intolerances, allergies and sensitivities (severe food allergies) or dietary restrictions (e.g. vegan lifestyle) * Acute or chronic infections, malignant disease, renal, hepatic (more than two-fold increased transaminases), pulmonary, neurological (epilepsy) or psychiatric diseases, manifested atherosclerosis, or any other disease precluding participation in the study. * Diabetes * Known alcohol, substance or drug abuse, concomitant medication * More than four hours of physical exercise per week * Women who are pregnant, breast-feeding or aiming to become pregnant during course of the trial * Women and men on hormonal supplementation * Women with an irregular menstrual cycle according to the FIGO criteria * Therapy with antidepressants within the past 6 months * Regular therapy with acetylsalicyclic acid or current medication to regulate blood sugar, blood pressure or lipids * Participants likely to fail to comply with the study protocol * Participants who do not give informed consent