Dr. Guillem Cuatrecasas is a Specialist in Endocrinology and Diabetes from the University of Barcelona. Professor of Nutrition at the Open University of Catalonia and researcher in several international clinical trials. Founder and Director of the CPEN, an Endocrionology and Nutrition Clinic Center in Barcelona. Actively involved in the COVID-19 crisis management, he became what we call a Covidologist in the hospitals that took the worst part during the pandemic. He has served on different national committees and is active member of the Spanish Society of Endocrinology (SEEN) and the European Association for the Study of Obesity (EASO).