Clinical Research Directory

Inclusion Criteria: * Nulliparous women (age: 18-35 years) with a regular menstrual cycle (25-32 days) * Legally competent/Consent to participate * Language proficiency in German (native speaker, fluent) * Physically and mentally healthy * Body mass index (BMI) of 18.5 - 30 kg/m2 Exclusion Criteria: * Current or use of hormonal contraceptives in the previous 6 months * Current use of hormonal intra-uterine devices (IUDs) * Previous or current pregnancy * Diagnosed psychological or metabolic disorder * Former or current illnesses of: 1. Brain or mind (including anxiety disorders, depression, eating disorders, personality disorders, alcohol, drugs or drug or non-substance dependence, neurological disorders other than occasional headache, psychiatric or neurological abnomalities) 2. Heart or blood circulation/cardiovascular disease (myocardial infarction, stroke, hypertension, hypotension, having a pacemaker) 3. Gastro-intestinal disorders (e.g. colon diseases, irritable bowel syndrome, Crohn's disease) 4. Endocrine disorders (e.g. thyroid disorders) 5. Other serious past or present medical conditions (for example, metabolic syndrome, diabetes) * Other serious health problems or current severe mental or physical stress. * Blood clotting disorder * Fear of drawing blood * Severe anemia * Previously diagnosed hypoglycemia episodes * Regular intake of medication (e.g. Antidepressant/anti-anxiety medication) * Blood donation within 4 weeks before the study appointment * Intake of anticoagulant medications * illegal drug consumption * smoking or nicotine consumption * extreme athletes * vegetarians or vegans or any other dietary restrictions due to allergies or intolerances * shift workers