Prof. Dr. Giuseppe Merra graduated in medicine and surgery in 2004, and specialized in internal medicine in 2009. In 2013, he received a Ph.D. in Oncobiology and Medical Oncology and a second level Masters in Dietetics and Nutrition. Since 2012, he has been a Fellow of the European Society of Internal Medicine and, since 2017, he has been a Fellow of the Royal Society of Medicine. Since 2010, he has been a staff physician of the Emergency Department of the “Agostino Gemelli” General Hospital Foundation of Rome and, since 2017, he has been an adjunct professor of gastroenterology at the School of Specialization in Infectious and Tropical Diseases of the Faculty of Medicine and Surgery of the Catholic University of Sacred Heart of Rome. Since 2019, he has been a Professor of Human Nutrition at the Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, of the University of Rome Tor Vergata, Italy. He is mainly interested in intestinal microbiota and the role of probiotics in microbiota modulation, as well as the microbiota–obesity ratio. He is a member of important national and international scientific societies. He is the author or co-author of more than 130 scientific works, including publications and abstracts. He has 70 publications with 1106 citations and an h-index of 17 (Scopus, 12 December 2023).