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. 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.
  2. Vanderhout, S, Maguire, JL. Milk and Health. N. Engl. J. Med. 2020;382 (23):e86. doi: 10.1056/NEJMc2005220. PubMed PMID:32492321 .
  3. 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.
  4. Aglipay, M, Vanderloo, LM, Cost, K, Maguire, JL, Birken, CS, TARGet Kids! Collaborative et al.. The Digital Media Environment and Cardiovascular Risk in Children. Can J Cardiol. 2020; :. doi: 10.1016/j.cjca.2020.04.015. PubMed PMID:32353533 .
  5. Sivanesan, H, Vanderloo, LM, Keown-Stoneman, CDG, Parkin, PC, Maguire, JL, Birken, CS et al.. The association between screen time and cardiometabolic risk in young children. Int J Behav Nutr Phys Act. 2020;17 (1):41. doi: 10.1186/s12966-020-00943-6. PubMed PMID:32345327 PubMed Central PMC7189472.
  6. Li, X, Keown-Stoneman, CDG, Lebovic, G, Omand, JA, Adeli, K, Hamilton, JK et al.. The association between body mass index trajectories and cardiometabolic risk in young children. Pediatr Obes. 2020; :e12633. doi: 10.1111/ijpo.12633. PubMed PMID:32181602 .
  7. Tombeau Cost, K, Korczak, D, Charach, A, Birken, C, Maguire, JL, Parkin, PC et al.. Association of Parental and Contextual Stressors With Child Screen Exposure and Child Screen Exposure Combined With Feeding. JAMA Netw Open. 2020;3 (2):e1920557. doi: 10.1001/jamanetworkopen.2019.20557. PubMed PMID:32022883 .
  8. Eny, KM, Jeyakumar, N, Dai, DWH, Maguire, JL, Parkin, PC, Birken, CS et al.. Sugar-containing beverage consumption and cardiometabolic risk in preschool children. Prev Med Rep. 2020;17 :101054. doi: 10.1016/j.pmedr.2020.101054. PubMed PMID:32021763 PubMed Central PMC6994294.
  9. Vanderhout, SM, Aglipay, M, Torabi, N, Jüni, P, da Costa, BR, Birken, CS et al.. Whole milk compared with reduced-fat milk and childhood overweight: a systematic review and meta-analysis. Am. J. Clin. Nutr. 2020;111 (2):266-279. doi: 10.1093/ajcn/nqz276. PubMed PMID:31851302 PubMed Central PMC6997094.
  10. Janus, M, Reid-Westoby, C, Lee, C, Brownell, M, Maguire, JL. Association between severe unaddressed dental needs and developmental health at school entry in Canada: a cross-sectional study. BMC Pediatr. 2019;19 (1):481. doi: 10.1186/s12887-019-1868-x. PubMed PMID:31810457 PubMed Central PMC6898915.
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Affiliations & Other Activities

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