Nanci Brady 2015Nanci S. Guest PhD, RD, CSCS is a Registered Dietitian with the Ontario College of Dietitians, Certified Personal Trainer and an NSCA Certified Strength and Conditioning Specialist, and she has been working in this field 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 behaviours, bone health and female athletes. She completed her doctoral research on the effects of gene-nutrient interactions (nutrigenomics) on athletic performance at the University of Toronto, where she continues to do research into the nutrient-gene relationships, plant-based nutrition and performance.

She has published her research in top journals, presented many abstracts at international meetings and given dozens of invited talks in Canada, the USA and Europe. In her 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). 

Dr. Guest is involved in research (athlete focus) as well as dietetic education and training for Nutrigenomix Inc., a genetic testing company based in Toronto. She also serves on their Scientific Advisory Board.

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 $125-150/hr, depending on total service hours. Discounts on consulting packages are available, please email for details*

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  • Sport Nutrition Services: Local and international consulting provided to coaches and athletes of all ages and levels, including professional and National-level athletes; create resource materials for coaches, team doctors, support staff and athletes
  • Genetic Testing for Personalized Nutrition – Health/Wellness, Plant-Based & Sport Performance
  • 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


University of Toronto PhD & current Post-Doc Research – Principal Investigator in a randomized control trial (RCT) of 100+ male athletes (registered at with Dr. Ahmed El-Sohemy (Nutritional Sciences Professor) at the Goldring Center for High Performance Sport at the University of Toronto. This includes skills in VO2max, Wingate, Lactate, Force Plate, Time Trials and other exercise testing. Initial results published in 2018, several more papers to be published 2020/2021.  Research into plant-based diets at the University of Toronto with Dr John Sievenpiper will begin mid- 2021.

Niagara College -2019-present – Instructor: Advanced Sports Nutrition for Registered Dietitians, Nutritionists, Coaches and other professionals working with athletes

Coaching Association Canada – 2016 – present (Canada) –  Sport Dietitian for national team / olympic athletes.

Nutrigenomix Inc. – November 2015 – present (Toronto, Canada) – Scientific Advisory Board member, Sport Scientist. Education and consulting.

Pan Am Games 2015  –  Head Dietitian/Consultant, liaison to all Pan Am Sport RD’s, games prep and dietitians services in the athletes village medical center (polyclinic). June 2013-Aug 2015 (Toronto, Canada)

Russian Olympic Committee – Nutrition Consultant for Russian National Winter Sports Teams (approximately 150 athletes) in preparation for Sochi 2014 Winter Olympics March 2012 – Jan. 2014 (Canada, USA, Bulgaria, Germany, Switzerland, Austria, Norway)

  • International travel to athlete training camps
  • Sport nutrition and supplement presentations to coaches, athletes, medical staff
  • Individualized dietary analyses, diet and supplement program for each athlete
  • Strength and conditioning program assessments

Canadian National Women’s Field Hockey Team – Team Dietitian  December 2010 – July 2012 (Canada, USA)

  • Traveling with athletes, menu planning, competition preparation (Pan Am 2011, London 2012)
  • Sport nutrition and supplement presentations to coaches, athletes, medical staff
  • Individualized dietary analyses, diet and supplement program for each athlete

Pure Fitness Gym – Personal Training and Registered Dietitian Services to club members – March 2009-present (Toronto, ON)

Vancouver 2010 Winter Olympic Games – Director of Sport Nutrition; Head Dietitian May 2006-March 2010 (Vancouver/Whistler, BC)

  • Lead team of volunteer dietitians to prepare for, and service the 2010 games
  • Research food and nutrition services from past games
  • Provide nutrition education to food service staff
  • Athlete’s Village preparation
    • Menu planning, food labels, special diets, food safety
    • Ensure food quality, accessibility and variety for athletes
    • Plan for and carry out  nutritional consulting services at Medical Polyclinics – during the 2010 Olympic and Paralympic games
    • Co-Author of the IOC Nutrition Working Group’s official athlete’s nutrition guide   – a reference for dietitians/coaches during the 2010 and future games

Vancouver Canucks NHL Hockey Team – Sport Nutritionist – June 2004 – June 2006 (Vancouver, BC)

  • Sports Nutrition Seminars – new players
  • One-on-one nutrition consulting
  • Development of Resource materials (recovery, fueling, supplements, general sports nutrition)

Canadian Diabetes Association – Certified Diabetes Educator (CDE) Certification Course Presenter for “Diabetes and Exercise” module to educate health care professionals on exercise prescription for patients at their diabetes, heart disease and obesity clinics. Spring 2001 – 2011 (Vancouver, BC and Toronto, Ontario)

Advantage for Athletes Training Facility– Strength and Conditioning Coach and Sport Dietitian to over 150 athletes age 10-21 years. Dietitian and personal training services to parents of athletes. December 2007 – December 2009 (Markham, Ontario)

University Instructor – March 2005-May 2007 (Vancouver/Abbotsford, BC)

  • University of British Columbia – School of Human Kinetics –  HKIN 489 (Sports Nutrition)
  • University of the Fraser Valley – Kinesiology and Physical Education Dept – KPE 260 (Intro Nutrition); KPE 460 (Disease & Nutrition; Sports Nutrition)