Exogenous Ketones and Behavior

Who May Qualify: - Consent to participate - Fluent in German - Physically healthy. No regular medication - No drug use 1 week prior to the study - BMI 18-31 kg/m2 Who Should NOT Join This Trial: - Former or current illnesses of: - Brain or mind (including eating disorders, personality disorders, alcohol, drugs or drug dependence, neurological disorders other than occasional headache; depression or anxiety disorder excluded) - Heart or blood circulation - Gastro-intestinal or endocrine disorders - Liver or kidney disorders - Electrolyte imbalance - Other serious past or present medical conditions (for example, metabolic syndrome, diabetes, cancer) - Pregnancy - Extreme athletes (\>2h/day intense work-out; casual cycling or walking is ok) - Menopause (post menopause is ok) - Ketogenic diet, ketogenic supplement intake, intermittent fasting or calorie restricted diet during preceding 4 weeks of study participation - Fear of blood draw Always talk to your doctor about whether this trial is right for you.