Metabolism and Nutrition Research Group, Louvain Drug Research Institute, Walloon Excellence in Life Sciences and BIOtechnology (Welbio), UCLouvain, Université Catholique De Louvain, Brussels, Belgium. Pôle Edin, Institut De Recherches Expérimentales Et Cliniques, UCLouvain, Université Catholique De Louvain, Brussels, Belgium. Division of Endocrinology and Nutrition, Cliniques Universitaires St-Luc, Brussels, Belgium. Laboratory of Microbiology, Wageningen University, Wageningen, The Netherland. Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland.