Impact of Shift Work on Glucose and Lipid Metabolism of Hospital Workers

Inclusion Criteria: * Aged between 18 and 67 * Male or female * Currently employed * Body-Mass-Index (BMI) \<40 kg/m2 * Working hours ≥28 hours/week * Employees working night shifts (group A): (1) Working night shifts for \>1 year, (2) at least two night shifts within the 2-week observation period * Employees not working night shifts (group B): No night shifts for \>1 year * Capable of giving consent * Health insurance * Good knowledge of German Exclusion Criteria: * Pregnancy and breastfeeding * Special diets, e.g. intermittent fasting * Severe acute or chronic diagnosed conditions, e.g., diabetes mellitus, liver or kidney disease (e.g., cirrhosis of the liver or kidney disease with a GFR \< 60), heart attack within the last 6 months, stroke, or systemic infections; current cancer or cancer diagnosed within the last 2 years * Bariatric surgery * Hereditary or acquired blood clotting disorders * severe mental health conditions, e.g., substance use disorders, eating disorders, or uncontrolled depression (individual assessment by study staff, if necessary following consultation with a physician) * Holiday in a different time zone (≥ 2 hours time difference) one month before study participation or within the 2-week observation phase * Participation in another study that could influence the results of the current study * Specific drug therapies that could influence the study results, e.g., antidiabetic medications including GLP-1 analogs, melatonin (Individual assessment by study staff, if necessary after consultation with a physician) * Implanted electronic medical devices, e.g., pacemakers or neurostimulators (to be assessed on a case-by-case basis by study staff, following consultation with a physician if necessary) * Physical or mental difficulties in understanding and following instructions from study staff