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. Lee, DID, Vanderhout, S, Aglipay, M, Birken, CS, Morris, SK, Piché-Renaud, PP et al.. Delay in childhood vaccinations during the COVID-19 pandemic. Can J Public Health. 2022; :. doi: 10.17269/s41997-021-00601-9. PubMed PMID:35060107 .
  2. Li, X, Vanderloo, LM, Keown-Stoneman, CDG, Cost, KT, Charach, A, Maguire, JL et al.. Screen Use and Mental Health Symptoms in Canadian Children and Youth During the COVID-19 Pandemic. JAMA Netw Open. 2021;4 (12):e2140875. doi: 10.1001/jamanetworkopen.2021.40875. PubMed PMID:34962557 PubMed Central PMC8715351.
  3. Nicholas, MN, Keown-Stoneman, CDG, Maguire, JL, Drucker, AM. Association Between Atopic Dermatitis and Height, Body Mass Index, and Weight in Children. JAMA Dermatol. 2022;158 (1):26-32. doi: 10.1001/jamadermatol.2021.4529. PubMed PMID:34787649 PubMed Central PMC8600455.
  4. Omand, JA, Janus, M, Maguire, JL, Parkin, PC, Aglipay, M, Randall Simpson, J et al.. Nutritional Risk in Early Childhood and School Readiness. J Nutr. 2021;151 (12):3811-3819. doi: 10.1093/jn/nxab307. PubMed PMID:34587245 .
  5. Anderson, LN, Fatima, T, Shah, B, Smith, BT, Fuller, AE, Borkhoff, CM et al.. Income and neighbourhood deprivation in relation to obesity in urban dwelling children 0-12 years of age: a cross-sectional study from 2013 to 2019. J Epidemiol Community Health. 2021; :. doi: 10.1136/jech-2021-216455. PubMed PMID:34489332 .
  6. D'Hollander, CJ, Keown-Stoneman, CDG, Birken, CS, O'Connor, DL, Maguire, JL, TARGet Kids! collaboration et al.. Timing of Introduction to Solid Food, Growth, and Nutrition Risk in Later Childhood. J Pediatr. 2022;240 :102-109.e3. doi: 10.1016/j.jpeds.2021.08.076. PubMed PMID:34481809 .
  7. Vanderhout, SM, Keown-Stoneman, CDG, Birken, CS, O'Connor, DL, Thorpe, KE, Maguire, JL et al.. Cow's milk fat and child adiposity: a prospective cohort study. Int J Obes (Lond). 2021;45 (12):2623-2628. doi: 10.1038/s41366-021-00948-6. PubMed PMID:34433906 .
  8. Lokku, A, Birken, CS, Maguire, JL, Pullenayegum, EM, TARGet Kids! Collaboration. Quantifying the extent of visit irregularity in longitudinal data. Int J Biostat. 2021; :. doi: 10.1515/ijb-2020-0144. PubMed PMID:34392639 .
  9. Vanderloo, LM, Omand, J, Keown-Stoneman, CDG, Janus, M, Tremblay, MS, Maguire, JL et al.. Association Between Physical Activity, Screen Time and Sleep, and School Readiness in Canadian Children Aged 4 to 6 Years. J Dev Behav Pediatr. 2021; :. doi: 10.1097/DBP.0000000000000986. PubMed PMID:34387247 .
  10. Li, X, Vanderloo, LM, Maguire, JL, Keown-Stoneman, CDG, Aglipay, M, Anderson, LN et al.. Public health preventive measures and child health behaviours during COVID-19: a cohort study. Can J Public Health. 2021;112 (5):831-842. doi: 10.17269/s41997-021-00549-w. PubMed PMID:34232489 PubMed Central PMC8261798.
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Affiliations & Other Activities

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