Dr Nathan A. Lewis currently works as the Lead Performance Nutrition Scientist for the UK Sports Institute (formerly the English Institute of Sport (EIS)), having worked as a senior performance nutritionist for the EIS across several Olympic cycles, including Beijing, London, Rio, Toyko, and now a fifth, Paris. Nathan has delivered nutritional programs to optimize health and performance to many athletes over the years, including World, Olympic and European Medalists across a spectrum of Olympic Sports. Outside of Olympic Sports, Nathan has experience consulting to Professional teams in the English Premier League, PGA Golf, NBA, NHL and MLB through his role as the Lead Performance and Clinical Nutritionist and Scientist at the Sports science and data analytics company ORRECO https://www.orreco.com. His research to date has focused on elite athletes, with reference to biomarkers, oxidative stress, fish oils, and unexplained under performance syndrome (Overtraining Syndrome). He has published papers in peer reviewed Sports Medicine and Science Journals and collaborated on various book chapters in the field of Sports Nutrition and Exercise Science.