Francisco Guarner Aguilar is Consultant of gastroenterology, Centro Médico Teknon (Barcelona, Spain),Consultant of Gastroenterology at the University Hospital Vall d’Hebron and Senior Researcher at the Digestive System Research Unit at the Vall d’Hebron Research Institute in Barcelona, Spain. ,Member of the ‘Guidelines & Publications Committee’ of the World Gastroenterology Organization (WGO), Chair of the Steering Committee of the International Human Microbiome Consortium,Member of the Scientific Committee of Gut Microbiota for Health Section of the European Society of Neurogastroenterology & Motility.