Peak Performance, based out of Ottawa, Ontario is a nutrition and exercise focused health professional practice led by Elizabeth (Beth) Mansfield, PhD, RD, CSSD, CEP.

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  • As a Registered Dietitian and Exercise Physiologist, Beth works with people who want to improve their overall nutritional health and physical wellness, manage risks of chronic disease, make body composition changes, deal with a newly diagnosed health condition or deal with a change in lifestyle that requires some dietary changes.

  • As a Clinical Specialist in Sport Dietetics (CSSD), Beth works with competitive and recreational athletes of all levels and ages to ensure that they are eating for peak health and performance in life and sport. 

  • As a workplace wellness advocate, Beth specializes in applying training principles developed for sport performance to business executives and the development of workplace wellness programming for both the government and business sectors.

  • Dr. Mansfield also conducts social science and behavioural research using evidence based analysis in a systematic way to answer practical food and nutrition related concerns/questions.

Select Scientific Publications:

    • Mansfield ED, Wahba R, Lafrenière J, & De Grandpré E. 2023. A risk-based labelling strategy for supplemented foods in Canada: consumer perspectives. Applied Physiology, Nutrition, and Metabolism, 48(10), 771-788.
    • Weiss BD, Abrams MA, Mansfield ED, and Sørensen K. 2023. New Directions for Health Literacy Research. Health Literacy Research and Practice;7(4):e225–e228. https://doi.org/10.3928/24748307-20231119-01.
    • Mansfield ED, Wahba R, and De Grandpré E. 2020. “Integrating a Health Literacy Lens into Nutrition Labelling Policy in Canada” International Journal of Environmental Research and Public Health 17, no. 11: 4130. https://doi.org/10.3390/ijerph17114130
    • Mansfield ED, Ibanez D, Chen F, Chen E and de Grandpré E. 2020. “Efficacy of “High in” Nutrient Specific Front of Package Labels—A Retail Experiment with Canadians of Varying Health Literacy Levels” Nutrients 12, no. 10: 3199. https://doi.org/10.3390/nu12103199
    • Mansfield ED, Wahba R, Gillis DE, Weiss BD, L’Abbé M. 2018. Canadian adaptation of the newest vital sign©, a health literacy assessment tool. Public Health Nutrition;21(11):2038-45.
    • Miller D, Jones-McLean E, Mansfield ED, Esslinger K, Elvidge Munene L, Dumais L, Verreault MF, St-Pierre S, and M Villeneuve. 2015. Health Reports – A surveillance tool to assess diets according to Eating Well with Canada’s Food Guide. Health Reports 82-003-X Vol 26 No.11, Statistics Canada.
    • Sinclair SE, Cooper, M, and ED Mansfield. 2014. The impact of menu labelling on calories selected or consumed: a systematic review and meta-analysis. Journal of the American Academy of Nutrition and Dietetics (Published online July 15, 2014; http://dx.doi.org/10.1016/j.jand.2014.05.014
    • Sinclair SE, Mansfield ED and GA Wells. 2013. Evidence for a whole grains and coronary heart disease health claim. International Food Risk Analysis Journal, ISBN: 1848-2368, InTech, DOI: 10.5772/56209.
    • Mansfield ED. 2013. Correlates of weight control in Canadian women. McGill University E-Thesis.
    • Mansfield ED, Ducharme N and KG Koski. 2012)Physical activity behaviours and beliefs of socioeconomically disadvantaged mothers in Canada. International Journal of Nutrition and Physical Activity, 9(42); http://www.ijbnpa.org/content/pdf/1479-5868-9-42.pdf
    • Mansfield ED, McPherson RP, and Koski, KG.1999. Diet and waist-to-hip ratio: important predictors of lipoprotein levels in sedentary and active young men with no evidence of cardiovascular disease. Journal of the American Dietetic Association, 99(11), pp.1373-1379.