Jonathon Maguire


Scientist, Li Ka Shing Knowledge Institute


Dr. Jonathon Maguire is an assistant professor of Pediatrics at the University of Toronto, a scientist at 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. 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. Abdullah, K, Birken, CS, Maguire, JL, Fehlings, D, Hanley, AJ, Thorpe, KE et al.. Re-Evaluation of Serum Ferritin Cut-Off Values for the Diagnosis of Iron Deficiency in Children Aged 12-36 Months. J. Pediatr. 2017; :. doi: 10.1016/j.jpeds.2017.03.028. PubMed PMID:28431746 .
  2. Lavigne, M, Birken, CS, Maguire, JL, Straus, S, Laupacis, A. Priority setting in paediatric preventive care research. Arch. Dis. Child. 2017; :. doi: 10.1136/archdischild-2016-312284. PubMed PMID:28404552 .
  3. Wong, PD, Birken, CS, Parkin, PC, Venu, I, Chen, Y, Schroth, RJ et al.. Total Breast-Feeding Duration and Dental Caries in Healthy Urban Children. Acad Pediatr. 2017;17 (3):310-315. doi: 10.1016/j.acap.2016.10.021. PubMed PMID:28385327 .
  4. Mansuri, S, Badawi, A, Kayaniyil, S, Cole, DE, Harris, SB, Mamakeesick, M et al.. Traditional foods and 25(OH)D concentrations in a subarctic First Nations community. Int J Circumpolar Health. 2016;75 (1):31956. doi: 10.3402/ijch.v75.31956. PubMed PMID:28156417 PubMed Central PMC5035507.
  5. Vanderhout, SM, Birken, CS, Parkin, PC, Lebovic, G, Chen, Y, O'Connor, DL et al.. Relation between milk-fat percentage, vitamin D, and BMI z score in early childhood. Am. J. Clin. Nutr. 2016;104 (6):1657-1664. doi: 10.3945/ajcn.116.139675. PubMed PMID:27852618 .
  6. Cox, KA, Parkin, PC, Anderson, LN, Chen, Y, Birken, CS, Maguire, JL et al.. Association Between Meat and Meat-Alternative Consumption and Iron Stores in Early Childhood. Acad Pediatr. ;16 (8):783-791. doi: 10.1016/j.acap.2016.01.003. PubMed PMID:26804490 .
  7. Anderson, LN, Maguire, JL, Lebovic, G, Hanley, AJ, Hamilton, J, Adeli, K et al.. Duration of Fasting, Serum Lipids, and Metabolic Profile in Early Childhood. J. Pediatr. 2017;180 :47-52.e1. doi: 10.1016/j.jpeds.2016.09.005. PubMed PMID:27742126 .
  8. De Souza, LR, Berger, H, Retnakaran, R, Vlachou, PA, Maguire, JL, Nathens, AB et al.. Hepatic fat and abdominal adiposity in early pregnancy together predict impaired glucose homeostasis in mid-pregnancy. Nutr Diabetes. 2016;6 (9):e229. doi: 10.1038/nutd.2016.39. PubMed PMID:27643724 PubMed Central PMC5048015.
  9. Saunders, NR, Parkin, PC, Birken, CS, Maguire, JL, Borkhoff, CM, TARGet Kids! Collaboration et al.. Iron status of young children from immigrant families. Arch. Dis. Child. 2016;101 (12):1130-1136. doi: 10.1136/archdischild-2015-309398. PubMed PMID:27582457 .
  10. Kapadia, MZ, Joachim, KC, Balasingham, C, Cohen, E, Mahant, S, Nelson, K et al.. A Core Outcome Set for Children With Feeding Tubes and Neurologic Impairment: A Systematic Review. Pediatrics. 2016;138 (1):. doi: 10.1542/peds.2015-3967. PubMed PMID:27365302 .
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Affiliations & Other Activities

  • Staff Pediatrician, Department of Pediatrics, St. Michael’s Hospital
  • Assistant professor of Pediatrics, University of Toronto