Dr. Justine Keathley

A photograph of Dr. Justine Keathley (née Horne).
Assistant Professor

Dr. Justine Keathley is a registered dietitian with the College of Dietitians of Ontario and an Assistant Professor in nutrition, exercise and metabolism at the University of Guelph. She completed her CIHR-funded PhD at Western University where she led a randomized controlled clinical trial evaluating the impact of providing genetic information on nutrition, exercise and health outcomes. She then pursued a CIHR-funded postdoctoral fellowship at Université Laval and a visiting postdoc with the Genomes to People Lab at Harvard University and Brigham & Women’s Hospital. During her postdoctoral fellowships, Dr. Keathley used various ‘omics’ technologies to study relationships between genes, nutrition, metabolites and health, and the interindividual variations that are observed. She is particularly interested in understanding the interplay between genetic variation, nutritional intake and health outcomes (nutritional genomics). Dr. Keathley is deeply passionate about evidence-based nutrition and was the lead author on the first clinical practice guidelines in nutritional genomics applications for omega-3 fatty acids and serum triglycerides.

  • BSc (Honors Specialization in Nutrition and Dietetics): Western University, 2013
  • MSc – Food and Nutrition: Western University/Brescia University College, 2015
  • PhD: Western University, 2020
  • Postdoctoral Fellowship: Université Laval, 2020 – 2022
  • Visiting Postdoctoral Fellowship: Genomes to People Lab at Harvard University and Brigham & Women’s Hospital, 2020 – 2021


Using various omics technologies, Dr. Keathley’s research program seeks to understand how genetic variation influences differing responses to nutrition and how this in turn impacts health outcomes. Her research also focuses on translational genomics, and seeks to identify how to best integrate nutritional genomics into clinical practice.

Winter 2023:

  • NUTR3210 – DE
  • FOOD/NUTR4090
  • HHNS*6320
  • HHNS*6910
  • HHNS*6920
  • HHNS*6930
Khan, S MSc Student

Currently accepting MSc coursework students and undergraduate research assistants. Please email your resume and academic transcript to jkeathle@uoguelph.ca.