Guy Guppy, is a performance nutritionist, he has a number of years of experience in preparing team sport and endurance athletes for competition, alongside the preparation of occupational groups for specific roles. Alongside this, he is a researcher and lecturer of Sport and Exercise Physiology and Performance Nutrition at Kingston University London.

He has been working in the field of sport and exercise performance since the mid-2000s. During this time, he gained a vast array of experience working with athletes in sports such as field hockey, football, ultra-distance running and endurance cycling. Alongside his experience of working with athletes, he has also worked with a number of occupational groups, such as military personnel preparing for tours of duty and those aspiring to join the services.