Jonathon Maguire

MD, FRCPC, MSc

Scientist

Biography

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. Massara, P, Keown-Stoneman, CDG, Maguire, JL, Bandsma, R, Comelli, EM, Birken, CS et al.. Understanding the association of longitudinal body mass index patterns in children and their parents: A data-driven study from the TARGet Kids! cohort. Obes Res Clin Pract. 2025; :. doi: 10.1016/j.orcp.2025.04.011. PubMed PMID:40335421 .
  2. Prajapati, M, Li, X, Philip, K, Keown-Stoneman, CDG, Omand, JA, Charach, A et al.. The association between learning models and child health behaviours during the COVID-19 pandemic. Prev Med Rep. 2025;54 :103071. doi: 10.1016/j.pmedr.2025.103071. PubMed PMID:40297567 PubMed Central PMC12036063.
  3. Bayoumi, I, Parkin, PC, Martin, M, Keown-Stoneman, CDG, Birken, CS, Maguire, JL et al.. Connecting Families: Poverty Screening and Financial Support Navigation for Families of Young Children in Primary Care: A Pilot Randomized Controlled Trial. Acad Pediatr. 2025;25 (5):102820. doi: 10.1016/j.acap.2025.102820. PubMed PMID:40139488 .
  4. D'Hollander, CJ, McCredie, VA, Uleryk, EM, Kucab, M, Le, RM, Hayosh, O et al.. Breastfeeding Support Provided by Lactation Consultants: A Systematic Review and Meta-Analysis. JAMA Pediatr. 2025;179 (5):508-520. doi: 10.1001/jamapediatrics.2024.6810. PubMed PMID:40029627 PubMed Central PMC11877411.
  5. Jolliffe, DA, Camargo, CA Jr, Sluyter, JD, Aglipay, M, Aloia, JF, Bergman, P et al.. Vitamin D supplementation to prevent acute respiratory infections: systematic review and meta-analysis of stratified aggregate data. Lancet Diabetes Endocrinol. 2025;13 (4):307-320. doi: 10.1016/S2213-8587(24)00348-6. PubMed PMID:39993397 PubMed Central PMC12056739.
  6. Tom, KN, Polack, AM, De Silva, ND, Wong, JP, Keown-Stoneman, CDG, Maguire, JL et al.. Childhood dyslipidemia: Clinician management practices in the primary care setting. Paediatr Child Health. 2024;29 (8):507-513. doi: 10.1093/pch/pxae018. PubMed PMID:39990037 PubMed Central PMC11840250.
  7. Palumbo, AM, Muraca, GM, Fuller, A, Keown-Stoneman, CDG, Birken, CS, Maguire, JL et al.. The association between self-reported total gestational weight gain by pre-pregnancy body mass index and moderate to late preterm birth. BMC Pregnancy Childbirth. 2025;25 (1):27. doi: 10.1186/s12884-024-07106-6. PubMed PMID:39799301 PubMed Central PMC11724485.
  8. Aglipay, M, Maguire, JL, Swayze, S, Tuite, A, Mamdani, M, Keown-Stoneman, C et al.. Initial Effectiveness of mRNA-1273 Against SARS-CoV-2 Infection and Hospitalization in Young Children. Open Forum Infect Dis. 2025;12 (1):ofae718. doi: 10.1093/ofid/ofae718. PubMed PMID:39758749 PubMed Central PMC11697100.
  9. Li, X, Kahane, A, Keown-Stoneman, CDG, Omand, JA, Borkhoff, CM, Lebovic, G et al.. Early childhood body mass index growth and school readiness: A longitudinal cohort study. Paediatr Perinat Epidemiol. 2024;38 (8):733-744. doi: 10.1111/ppe.13114. PubMed PMID:39607066 .
  10. Soczynska, I, da Costa, BR, O'Connor, DL, Jenkins, DJ, Birken, CS, Keown-Stoneman, CD et al.. A Systematic Review on the Impact of Plant-Based Milk Consumption on Growth and Nutrition in Children and Adolescents. J Nutr. 2024;154 (11):3446-3456. doi: 10.1016/j.tjnut.2024.09.010. PubMed PMID:39332772 .
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Affiliations & Other Activities

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