Jonathon Maguire


Scientist, Li Ka Shing Knowledge Institute


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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. Bayoumi, I, Parkin, PC, Birken, CS, Maguire, JL, Borkhoff, CM, TARGet Kids! Collaboration et al.. Association of Family Income and Risk of Food Insecurity With Iron Status in Young Children. JAMA Netw Open. 2020;3 (7):e208603. doi: 10.1001/jamanetworkopen.2020.8603. PubMed PMID:32729920 .
  6. Soczynska, I, Dai, D, O'Connor, DL, Birken, CS, Maguire, JL, TARGet Kids! collaboration et al.. Age of cow milk introduction and growth among 3-5-year-old children. Public Health Nutr. 2020; :1-7. doi: 10.1017/S1368980020001925. PubMed PMID:32723404 .
  7. Vanderloo, LM, Maguire, JL, Dai, DWH, Parkin, PC, Borkhoff, CM, Tremblay, MS et al.. Association of Physical Activity and Cardiometabolic Risk in Children 3-12 Years. J Phys Act Health. 2020; :1-7. doi: 10.1123/jpah.2020-0028. PubMed PMID:32677625 .
  8. Gunaseelan, V, Parkin, PC, Wahi, G, Birken, CS, Maguire, JL, Macarthur, C et al.. Maternal ethnicity and iron status in early childhood in Toronto, Canada: a cross-sectional study. BMJ Paediatr Open. 2020;4 (1):e000635. doi: 10.1136/bmjpo-2020-000635. PubMed PMID:32509978 PubMed Central PMC7254107.
  9. Vanderhout, S, Maguire, JL. Milk and Health. N Engl J Med. 2020;382 (23):e86. doi: 10.1056/NEJMc2005220. PubMed PMID:32492321 .
  10. Vanderhout, SM, Aglipay, M, Birken, C, Li, P, O'Connor, DL, Thorpe, K et al.. Cow's Milk Fat Obesity pRevention Trial (CoMFORT): a primary care embedded randomised controlled trial protocol to determine the effect of cow's milk fat on child adiposity. BMJ Open. 2020;10 (5):e035241. doi: 10.1136/bmjopen-2019-035241. PubMed PMID:32385063 PubMed Central PMC7228521.
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Affiliations & Other Activities

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