Time-restricted Eating and Cognition

Inclusion Criteria: * right-handed * legally competent * physically and mentally healthy * BMI: 19-35 kg/m² * fluent in reading and speaking German Exclusion Criteria: * weight change \>5% of body weight during the last 3 months * pregnancy or breastfeeding * allergies (inclusion possible after consultation with study doctor) * history of cardiovascular disease (myocardial infarction, stroke, hypertension, hypotension) in the last year * severe psychiatric condition, including drug addiction and depression * impaired renal or liver function * dementia or other severely debilitating cognitive disease * history of or current eating disorders (e.g., Bulimia nervosa, Anorexia nervosa, Orthorexia nervosa, Binge-Eating disorder) * chronic diseases (e.g., Morbus Crohn, Colitis Ulcerosa) * metabolic disorders (e.g., metabolic syndrome, diabetes type 1 or 2) * hormonal imbalances (e.g., thyroid gland diseases) * consuming diseases (e.g., cancer, kachexie) in the last 2 years * surgical removal (partial removal) of the digestive organs (e.g., gastrectomy) or history of bariatric surgery * Autoimmune conditions or current infection * Blood clotting disorders (e.g., haemophilia) * Severe anemia * severe claustrophobia * blood donation four weeks prior to study entry * glucocorticoid therapy (oral) * anticoagulant medication (inclusion possible if medication can be paused) * taking medications that require regular eating * any medications or supplements known to affect sleep, circadian rhythms, immune activity or metabolism * taking weight loss, lipid or glucose-lowering medications (any medications that affects metabolism) i.e. metformin * pacemaker or other electrical implant * vaccination during the study course or in the two weeks' prior * immunosuppressive premedication * currently on a diet/fasting regime (or within 1 month) * professional athletes * nicotine consumption * drug abuse * alcohol consumption per week more than 14 beers (0,3l)/ wine (0,125l)/ sparkling wine (0,1l)/Schnaps (4cl) * shift work * poor sleep quality (PSQI score \> 10 at medical screening) * travel across more than one time zone one month before study or during study period * non-removable metallic implants * fear of blood draw