Institut de Recerca de l'Hospital Santa Creu i Sant Pau, Institut d'Investigacions Biomèdiques (IIB) Sant Pau, 08041 Barcelona, Spain. CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 08907 Barcelona, Spain. Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London SW7 2AZ, UK. AZTI, Food Research, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia, AstondoBidea, Edificio 609, 48160 Derio, Spain. Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London SW7 2AZ, UK. Hospital de la Santa Creu i Sant Pau, Servei de Bioquímica-Institut d'Investigacions Biomèdiques (IIB) Sant Pau, 08041 Barcelona, Spain. Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.