Neurotensin (NT) is a gut peptide released postprandially from the small intestine. It is known to exert a range of enterogastrone effects and in animal models it reduces food intake when administered by parenteral routes.

In this study, after a 1h baseline period, three doses (2.5, 5.0 and 7.5pmol/kg/min) of NT will be administered in sequence each infusion lasting 1h. On a placebo day saline will be infused similarly 1h infusions. During the final infusion (7.5pmol/kg/min) an ad libitum meal will be ingested. During the experiments blood samples will be collected and subjective perceptions recorded using validated visual analogue scales.

Inclusion Criteria:

• Age = or above 18 years
• normal haemoglobin levels
• male
• Informed consent

Exclusion Criteria:

• Diabetes mellitus (fasting plasma glucose or HbA1c)
• Familiy history of diabetes mellitus
• Intestinal disease (incl e.g. inflammatory bowel disease and malabsorbtion)
• Family history of inflammatory bowel disease
• Previous intestinal resection
• Body mass index (BMI) over 25 kg/m2
• Smoker
• Nephropathy (S-creatinine> 130 μM)
• Liver disease (ALAT and/or ASAT > 2 × upper normal limit)

Double blinded. Neither the investigators performing the experiments or the participants know the nature of the intervention on the two study days.