Dr. Nanci S. Guest is a registered dietitian with the Ontario College of Dietitians, nutritional sciences and agriculture researcher, international speaker, NSCA strength and conditioning coach, and most recently a regenerative, organic, veganic farmer where she grows plant proteins such as soy and fava beans, fruits and vegetables with animal-free compost and fertilizer. She also uses electricity-powered equipment and solar energy on her farm in order to meet net zero targets for carbon emissions. She has been working in private practice since 1996.

Dr. Guest attended the University of British Columbia and completed her Bachelor of Science degrees in agriculture / animal science (1995) and dietetics (1999) with a focus on exercise physiology/kinesiology, and also completed her Master of Science degree in nutritional sciences (2004) where she conducted research on disordered eating behaviors, bone health and female athletes. She completed her doctoral research on the effects of gene-nutrient interactions on athletic performance at the University of Toronto, where she continues to do research part-time in plant-based nutrition for health, performance & sustainability. She develops and teaches online courses in plant-based sport nutrition and sustainable agriculture at the University of Guelph. She is an expert panel member and co-author on various research projects and publications supporting the 2024 Position Paper from the Academy of Nutrition and Dietetics on Vegetarian Dietary Patterns.

She has published her research in top journals, presented many abstracts at international meetings and given dozens of invited talks in Canada, the USA, Brazil and Europe. In her part-time post-doctoral work also at the University of Toronto she is fulfilling her special interest in plant-based diets, climate change, the environment and supporting animal welfare initiatives by helping individuals reduce their animal foods consumption.

Dr. Guest is a global consultant to professional and amateur athletes and teams, in addition to having the role of head dietitian at both the Vancouver 2010 Olympics (her hometown) and the Toronto 2015 Pan Am games, and as a consultant to various international and Canadian athletes in preparation for the last four London, Sochi,  Rio, and PyeongChang Olympics. Many of the athletes she prepared for Sochi went on to win several gold and silver medals. With her strong foundation as a strength and conditioning coach along with her vast experience in an exercise research lab, Dr. Guest has a thorough understanding of exercise physiology and the physical demands of training, which has resulted in a unique skill-set focusing on advanced sports nutrition strategies.

Experience includes work with the Vancouver Canucks, other members of the NHL, NBA and CFL, Women’s National Field Hockey, Women’s National Ice Hockey, World Junior Hockey in addition to working with many other sports / athletes to include pro UFC, boxers, open water divers, pentathletes, equestrians, iron-man and triathlon athletes, ultra-endurance cyclists, tennis players, skaters, swimmers, middle-distance runners, gymnasts, biathletes, snowboarders and soccer and rugby players. Dr Guest also taught sport nutrition at the University of British Columbia and the University of the Fraser Valley from 2005-2007 and teaches online sport nutrition courses at Niagara College (2020-present). She is currently an authorized service provider for the Coaching Association of Canada and a past lead Sport Dietitian rep for CLIF Bar Canada (2014-2019) , where she also briefly served on the CLIF Nutrition Advisory Council (USA). Previously she was director of dietetic education and training for Nutrigenomix Inc., a genetic testing company based in Toronto. She also served on their Scientific Advisory Board from 2014-2023.

Dr. Nanci Guest is available for individual and/or group/team consultations, seminars and grocery store tours. Parent, spouse and/or coaching staff education is also available and highly recommended. Services now available in Collingwood. 

*Consulting Fees range from $125-165/hr, depending on total service hours. Discounts on consulting packages are available, please email for details*

   – – – – – – – –

SERVICES

• Plant-Based / Vegan Nutrition Services: Local and international consulting provided to the general public as well as coaches and athletes of all ages and levels, including professional and National-level athletes

• Seminars/Conferences: international fitness/dietetic/sport science conferences; to athletes, coaches, and various health professionals; to high school/ university/college students, as well as to the general public; topics include advanced sports nutrition, general nutrition, and various health and fitness topics

• Media Services – TV- live or taped, radio, podcasts, written interviews and special events.

• Research: For industry research and/or collaborations, please contact.

• General Dietitian/Nutrition services: dietary analyses; individual, family, corporate and team counselling; diet plans, grocery store tours and development of information resources

• Personal Training / Bootcamp: private in-home, health club, office and outdoor bootcamp in the park (all ages and fitness levels)

• Strength and Conditioning Coaching to Athletes: training a variety of sport disciplines and strategies for competition to athletes of all ages and levels

• Food Product Development: food industry research and development; developed award-winning Optimum® Post-Exercise Recovery Cereal for Nature’s Path® (sold in 8 countries in 2006)

• Articles / Educational materials: national/local publications, websites, newsletters, schools/textbooks – general nutrition, vegan/plant-based sport nutrition, fitness, nutrigenomics