Inclusion Criteria:  Healthy subjects with normal glucose tolerance determined according to an oral glucose tolerance test; BMI ≤ 30 kg/m2.  Exclusion Criteria:  Plasma triglycerides > 5.0 mmol/L at fasting; More than 2 alcohol consumption per day; More than 1 cigarette per day; History of total cholesterol level > 7 mmol/L, of cardiovascular disease, hypertensive crisis; Treatment with fibrates, thiazolidinedione, insulin,betablockers or other drugs with effects on insulin resistance or lipid metabolism (exception for antihypertensive drugs, statins or metformin); Presence of a noncontrolled thyroid disease, renal or hepatic disease, history of pancreatitis, bleeding diatheses, cardiovascular disease or any other serious medical conditions; History of serious gastrointestinal disorders (malabsorption, peptic ulcer, gastroesophageal reflux having required a surgery, etc.); reflux having required a surgery, etc.); Presence of a pacemaker; Have undergone of PET study or CT scan in the past year; Chronic administration of any medication;