Prof. Theocharis Koufakis holds a medical degree from Aristotle University and a Ph.D. in the pathophysiology of complex diseases from the Medical School at the University of Thessaly, Greece. He completed his specialty training in Internal Medicine at the General Hospital of Larissa, Greece; and received post-graduate training in Diabetes at King’s College Hospital, London, UK, and Aristotle University, Thessaloniki, Greece. He is a Greek Ministry of Health-certified diabetologist. At present, he is an Assistant Professor of Internal Medicine at Aristotle University in Thessaloniki, Greece, where he is engaged in clinical, research, and teaching work. His main research interests include diabetes mellitus and the effects of religious fasting on human health.