Jonathon Maguire




Dr. Jonathon Maguire is a Scientist in the Li Ka Shing Knowledge Institute of St. Michael’s Hospital and a Staff Pediatrician in the Department of Pediatrics at St. Michael’s Hospital with an active pediatric hospitalist and outpatient clinical practice. He is also an Associate Professor of Pediatrics at the University of Toronto. His research interests focus on clinical trials involving nutrition and development in young children, as well as the creation of tools to facilitate evidence informed child health practice. He co-leads TARGet Kids!, the largest primary care research network for children in Canada. He has received a number of peer reviewed operating grants including a 2015 Canadian Institutes of Health Research Foundation Grant, as well as a several awards including the Samuel J. Fomon Young Physician Award from the American Society of Nutrition, the Canadian Paediatric Society Young Investigator Award, a Canadian Institutes of Health Research New Investigator Award and an Ontario Ministry of Research and Innovation Early Researcher Award.

Recent Publications

  1. Cost, KT, Crosbie, J, Anagnostou, E, Birken, CS, Charach, A, Monga, S et al.. Mostly worse, occasionally better: impact of COVID-19 pandemic on the mental health of Canadian children and adolescents. Eur Child Adolesc Psychiatry. 2021; :. doi: 10.1007/s00787-021-01744-3. PubMed PMID:33638005 PubMed Central PMC7909377.
  2. Dennis, CL, Marini, F, Dick, JA, Atkinson, S, Barrett, J, Bell, R et al.. Protocol for a randomised trial evaluating a preconception-early childhood telephone-based intervention with tailored e-health resources for women and their partners to optimise growth and development among children in Canada: a Healthy Life Trajectory Initiative (HeLTI Canada). BMJ Open. 2021;11 (2):e046311. doi: 10.1136/bmjopen-2020-046311. PubMed PMID:33568380 PubMed Central PMC7878148.
  3. Parkin, PC, Borkhoff, CM, Macarthur, C, Abdullah, K, Birken, CS, Fehlings, D et al.. Randomized Trial of Oral Iron and Diet Advice versus Diet Advice Alone in Young Children with Nonanemic Iron Deficiency. J Pediatr. 2021; :. doi: 10.1016/j.jpeds.2021.01.073. PubMed PMID:33548262 .
  4. Vanderhout, SM, Birken, CS, Wong, P, Kelleher, S, Weir, S, Maguire, JL et al.. Family perspectives of COVID-19 research. Res Involv Engagem. 2020;6 (1):69. doi: 10.1186/s40900-020-00242-1. PubMed PMID:33292759 PubMed Central PMC7703500.
  5. Jamnik, J, Keown-Stoneman, C, Eny, KM, Maguire, JL, Birken, CS, TARGet Kids! Collaboration et al.. Mealtime media use and cardiometabolic risk in children. Public Health Nutr. 2020; :1-10. doi: 10.1017/S1368980020003821. PubMed PMID:33263271 .
  6. Li, X, Keown-Stoneman, CDG, Lebovic, G, Maguire, JL, Omand, JA, Sievenpiper, JL et al.. Body Mass Index Mediates the Association between Growth Trajectories and Cardiometabolic Risk in Children. Child Obes. 2021;17 (1):36-42. doi: 10.1089/chi.2020.0143. PubMed PMID:33252262 .
  7. Hattangadi, N, Cost, KT, Birken, CS, Borkhoff, CM, Maguire, JL, Szatmari, P et al.. Parenting stress during infancy is a risk factor for mental health problems in 3-year-old children. BMC Public Health. 2020;20 (1):1726. doi: 10.1186/s12889-020-09861-5. PubMed PMID:33198683 PubMed Central PMC7670792.
  8. Vanderloo, LM, Keown-Stoneman, CDG, Sivanesan, H, Parkin, PC, Maguire, JL, Anderson, LN et al.. Association of screen time and cardiometabolic risk in school-aged children. Prev Med Rep. 2020;20 :101183. doi: 10.1016/j.pmedr.2020.101183. PubMed PMID:32923316 PubMed Central PMC7475188.
  9. Anderson, LN, Sandhu, R, Keown-Stoneman, CDG, De Rubeis, V, Borkhoff, CM, Carsley, S et al.. Latent class analysis of obesity-related characteristics and associations with body mass index among young children. Obes Sci Pract. 2020;6 (4):390-400. doi: 10.1002/osp4.414. PubMed PMID:32874674 PubMed Central PMC7448165.
  10. Richmond, SA, Pike, I, Maguire, JL, Macpherson, A. E-cigarettes: A new hazard for children and adolescents. Paediatr Child Health. 2020;25 (5):317-321. doi: 10.1093/pch/pxaa078. PubMed PMID:32765168 PubMed Central PMC7395323.
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Affiliations & Other Activities

  • Staff Pediatrician, Department of Pediatrics, St. Michael’s Hospital
  • Associate Professor, Department of Pediatrics, University of Toronto