Inclusion Criteria:  Programmed surgeries in the abdominal area in the Department of Surgery and Transplantation at Cliniques Universitaires Saint-Luc under the supervision of Prof. Dr. Benoit Navez. Hospitalization in the context of surgery Male Caucasian Age between 18 and 60 years (included). Body mass index less than 30 and greater than or equal to 18.5 Programmed Nissen fundoplication (to treat hiatal hernia and gastroesophageal reflux) or cholecystectomy (to treat vesicular lithiasis). Adults capable of expressing their wishes. Understanding French  Exclusion Criteria:  Body mass index below 18.5 and above 30. Patients with cancer, infection, autoimmune or inflammatory disease, metabolic syndrome. Patients with beta-blockers, hypoglycemics, anti-diabetics, hypolipidemics. Women Adults unable to express their will. Not understanding French Patients participating in a clinical trial for a drug treatment.