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 clinical practice. He is an Associate Professor of Pediatrics and Lawson Chair in Patient Engagement in Child Nutrition 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 Canadian Institutes of Health Research Foundation Grant and a CIHR/SPOR Innovative Clinical Trials Mentorship Chair.

Recent Publications

  1. Cohen-Silver, J, Cost, K, Navarro, J, Maguire, JL. Pediatric psychoSocial Risk Index: Factor Analysis and Item Reduction Study. Hosp Pediatr. 2024;14 (6):. doi: 10.1542/hpeds.2023-007239. PubMed PMID:38712444 .
  2. To, T, Borkhoff, CM, Anderson, LN, Birken, CS, Dell, SD, Janus, M et al.. Association of factors with childhood asthma and allergic diseases using latent class analysis. Sci Rep. 2024;14 (1):6874. doi: 10.1038/s41598-024-56805-9. PubMed PMID:38519555 PubMed Central PMC10959981.
  3. Nickolls, BJ, Relton, C, Hemkens, L, Zwarenstein, M, Eldridge, S, McCall, SJ et al.. Randomised trials conducted using cohorts: a scoping review. BMJ Open. 2024;14 (3):e075601. doi: 10.1136/bmjopen-2023-075601. PubMed PMID:38458814 PubMed Central PMC10928784.
  4. Braat, S, Fielding, KL, Han, J, Jackson, VE, Zaloumis, S, Xu, JXH et al.. Haemoglobin thresholds to define anaemia from age 6 months to 65 years: estimates from international data sources. Lancet Haematol. 2024;11 (4):e253-e264. doi: 10.1016/S2352-3026(24)00030-9. PubMed PMID:38432242 PubMed Central PMC10983828.
  5. Braddon, KE, Keown-Stoneman, CDG, Dennis, CL, Li, X, Maguire, JL, O'Connor, DL et al.. The mediation effect of breastfeeding duration on the relationship between maternal preconception BMI and childhood nutritional risk. Eur J Clin Nutr. 2024;78 (5):427-435. doi: 10.1038/s41430-024-01420-0. PubMed PMID:38431673 .
  6. Yoshida-Montezuma, Y, Keown-Stoneman, CDG, Birken, CS, Maguire, JL, Brown, HK, Anderson, LN et al.. Association of birthweight with diabetes, hypertension, and ischemic heart disease in young adulthood: a retrospective cohort study. J Dev Orig Health Dis. 2023;14 (6):719-727. doi: 10.1017/S2040174423000417. PubMed PMID:38224025 .
  7. Soczynska, I, da Costa, BR, O'Connor, DL, Jenkins, DJ, Birken, CS, Keown-Stoneman, CD et al.. Plant-Based Milk Consumption and Growth in Children 1-10 Years of Age. J Nutr. 2024;154 (3):985-993. doi: 10.1016/j.tjnut.2023.12.046. PubMed PMID:38219863 .
  8. South, CA, Keown-Stoneman, CDG, Birken, CS, Malik, V, Zlotkin, SH, Maguire, JL et al.. Underweight in the first 2 years of life and nutrition risk in later childhood: a prospective cohort study. J Hum Nutr Diet. 2024;37 (2):474-483. doi: 10.1111/jhn.13269. PubMed PMID:38149751 .
  9. Monteith, H, Mamakeesick, M, Rae, J, Galloway, T, Harris, SB, Birken, C et al.. Determinants of Anishinabeck infant and early childhood growth trajectories in Northwestern Ontario, Canada: a cohort study. BMC Pediatr. 2023;23 (1):641. doi: 10.1186/s12887-023-04449-5. PubMed PMID:38115010 PubMed Central PMC10729431.
  10. Hattangadi, N, Kay, T, Parkin, PC, Birken, CS, Maguire, JL, Szatmari, P et al.. Screening Accuracy of the Parent-Report Preschool Strengths and Difficulties Questionnaire in Primary Care. Acad Pediatr. 2023; :. doi: 10.1016/j.acap.2023.10.007. PubMed PMID:37907129 .
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Affiliations & Other Activities

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