- control: subjects will be studied after 6 days of a a high fructose diet (isocaloric diet containing 45 % complex carbohydrate, 10% sugars, 30% fat, and 15% protein, additionned with 3.0 g/kg body weight/day fructose) and measurements will be performed in basal conditions and after administration of a standard test meal with 0.3 g/kg protein.