Inclusion Criteria:  Voluntary written informed consent of the participant has been obtained prior to any screening procedures Women of child-bearing potential agree to apply a highly effective methods of birth control; defined as those that, alone or in combination, result in low failure rate (i.e., less than 1% per year) when used consistently and correctly; such as implants, injectables, combined oral contraceptives, some IUDs, true sexual abstinence (i.e. refraining from heterosexual intercourse during the entire period of risk associated with the Trial treatment(s)) or commitment to a vasectomised partner. Women of non-childbearing potential may be included if surgically sterile (tubal ligation or hysterectomy) or postmenopausal with at least 2 year without spontaneous menses. Healthy volunteers Subjects aged 18-55 years old (55y included). Male or female subjects. Subjects who are capable to understand the study and the questionnaires, and to comply with the study requirements.  Exclusion Criteria:  Any disorder, which in the Investigator's opinion might jeopardise the participant's safety or compliance with the protocol Any prior or concomitant treatment(s) that might jeopardise the participant's safety or that would compromise the integrity of the Trial Female who is pregnant, breast-feeding or intends to become pregnant or is of child-bearing potential and not using an adequate, highly effective contraceptive Presence of a history of gastrointestinal surgery other than appendectomy Presence of organic or functional gastrointestinal disease Presence of gastro-intestinal symptoms Major psychiatric disorder such as major depression Presence of any disease affecting the gastrointestinal tract or hepatobiliary system. History of allergic reaction to CRH BMI equal to 30 mg/kg² or higher.  Use of drugs included in this list:  Opioids (unless short intake for acute pain and > 1month ago) Amitriptyline or mirtazapine; other antidepressants are allowed if the HV is on a stable dose and the drug is not combined with other antidepressants. Corticosteroids Antihistaminic drugs (last 2 weeks) Proton pump inhibitors (last 2 weeks) Disodiumchromoglycate or other mast cell stabilizers (last 2 weeks) Leukotriene receptor antagonists (last 2 weeks) NSAIDs (last 2 weeks) Antibiotics (last 2 months) Probiotics (last 2 weeks) Other medication: to be discussed with physician