Nutrition-Gut-Brain Interactions Research Centre, Faculty of Health and Medicine, School of Medical Sciences, Örebro University, 701 82 Örebro, Sweden. Nutrition, Metabolism and Genomics group, Division of Human Nutrition and Health, Wageningen University, 6708 PB Wageningen, The Netherlands. Laboratory of Microbiology, Wageningen University and Research Centre, 6708 PB Wageningen, The Netherlands. Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland. Nutrition-Gut-Brain Interactions Research Centre, Faculty of Health and Medicine, School of Medical Sciences, Örebro University, 701 82 Örebro, Sweden. julia.konig@oru.se.