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. Wong, PD, Anderson, LN, Dai, DDW, Parkin, PC, Maguire, JL, Birken, CS et al.. The Association of Breastfeeding Duration and Early Childhood Cardiometabolic Risk. J. Pediatr. 2018;192 :80-85.e1. doi: 10.1016/j.jpeds.2017.09.071. PubMed PMID:29246362 .
  2. Aglipay, M, Maguire, JL. Vitamin D Supplementation and Upper Respiratory Tract Infections in Children-Reply. JAMA. 2017;318 (21):2139-2140. doi: 10.1001/jama.2017.15154. PubMed PMID:29209716 .
  3. Anderson, LN, Carsley, S, Lebovic, G, Borkhoff, CM, Maguire, JL, Parkin, PC et al.. Misclassification of child body mass index from cut-points defined by rounded percentiles instead of Z-scores. BMC Res Notes. 2017;10 (1):639. doi: 10.1186/s13104-017-2983-0. PubMed PMID:29183360 PubMed Central PMC5706297.
  4. Albaum, JM, Carsley, S, Chen, Y, Dai, DWH, Lebovic, G, McCrindle, BW et al.. Persistent High Non-High-Density Lipoprotein Cholesterol in Early Childhood: A Latent Class Growth Model Analysis. J. Pediatr. 2017;191 :152-157. doi: 10.1016/j.jpeds.2017.08.079. PubMed PMID:29173300 .
  5. Parks, CA, Brett, NR, Agellon, S, Lavery, P, Vanstone, CA, Maguire, JL et al.. DHA and EPA in red blood cell membranes are associated with dietary intakes of omega-3-rich fish in healthy children. Prostaglandins Leukot. Essent. Fatty Acids. 2017;124 :11-16. doi: 10.1016/j.plefa.2017.08.003. PubMed PMID:28870372 .
  6. Sharp, JR, Maguire, JL, Carsley, S, Abdullah, K, Chen, Y, Perrin, EM et al.. Temperament Is Associated With Outdoor Free Play in Young Children: A TARGet Kids! Study. Acad Pediatr. 2017; :. doi: 10.1016/j.acap.2017.08.006. PubMed PMID:28842293 .
  7. Persaud, N, Ziai, H, Lebovic, G, Maguire, JL, Khovratovich, M, Simpson, JAR et al.. Parent reported nutritional risk and laboratory indices of cardiometabolic risk and in preschool-aged children. J. Pediatr. Endocrinol. Metab. 2017;30 (8):839-846. doi: 10.1515/jpem-2016-0328. PubMed PMID:28723611 .
  8. Aglipay, M, Birken, CS, Parkin, PC, Loeb, MB, Thorpe, K, Chen, Y et al.. Effect of High-Dose vs Standard-Dose Wintertime Vitamin D Supplementation on Viral Upper Respiratory Tract Infections in Young Healthy Children. JAMA. 2017;318 (3):245-254. doi: 10.1001/jama.2017.8708. PubMed PMID:28719693 .
  9. Morency, ME, Birken, CS, Lebovic, G, Chen, Y, L'Abbé, M, Lee, GJ et al.. Association between noncow milk beverage consumption and childhood height. Am. J. Clin. Nutr. 2017;106 (2):597-602. doi: 10.3945/ajcn.117.156877. PubMed PMID:28592600 .
  10. Omand, JA, To, T, O'Connor, DL, Parkin, PC, Birken, CS, Thorpe, KE et al.. 25-Hydroxyvitamin D supplementation and health-service utilization for upper respiratory tract infection in young children. Public Health Nutr. 2017;20 (10):1816-1824. doi: 10.1017/S1368980017000921. PubMed PMID:28578751 .
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Affiliations & Other Activities

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