Dr. Sievenpiper is currently an Associate Professor in the Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, where he holds the PSI Foundation Graham Farquharson Knowledge Translation Fellowship.
He is also a Consultant Physician in the Division of Endocrinology & Metabolism; Scientist in the Li Ka Shing Knowledge Institute, and Knowledge Synthesis Lead in the Toronto 3D Knowledge Synthesis & Clinical Trials Unit at St. Michael’s Hospital. His current research interests focus on using meta-analytical techniques and randomized controlled trials to investigate diet and disease relationships.
He has been appointed to the Expert Committees of Diabetes Canada 2013 Clinical Practice Guidelines for Nutrition Therapy, the European Association for the study of Diabetes (EASD) 2015 Clinical Practice Guidelines for Nutrition Therapy, the 2015 Canadian Cardiovascular Society (CCS) Dyslipidemia Guidelines Update, as well as the American Society for Nutrition (ASN) for a scientific statement on sugars. Dr. Sievenpiper has authored over 100 scientific papers, 12 book chapters, 118 abstracts, and 26 successful grant applications.
His work has been cited more than 1700 times for an h-index of 25.
Industry Expertise (5)
Health Care - Services
Health and Wellness
Training and Development
Areas of Expertise (6)
Graham Farquharson Knowledge Translation Fellowship (professional)
Awarded by the PST Foundation to provide salary support for a new Ontario investigator, who has demonstrated the ability to successfully complete high impact knowledge translation research.
Canadian Diabetes Association Clinician Scientist Award (professional)
Awarded by Diabetes Canada for 2015-2020.
Sun Life Financial New Investigator Award (professional)
Awarded by the Banting & Best Diabetes Centre at the University of Toronto.
Canadian Nutrition Society New Investigator Partnership Prize (professional)
CIHR INMD Award.
Outstanding Resident of the Year Award (professional)
Awarded by Hamilton Health Sciences, Medical Staff Association.
McMaster University: FRCPC, Medical Biochemistry 2014
St. Matthew's University: MD., Medicine 2008
University of Toronto: Postdoctoral Fellowship, Nutritional Sciences
University of Toronto: Ph.D., Nutritional Sciences 2004
University of Toronto: M.Sc., Nutritional Sciences 2000
- University of Toronto : Nutritional Medical Education Coordinator Department of Nutritional Sciences
- St. Michael's Hospital : Scientist Li Ka Shing Knowledge Institute
- St. Michael's Hospital : Knowledge Synthesis Lead Toronto 3D Knowledge Synthesis & Clinical Trials Unit Clinical Nutrition and Risk Factor Modification Centre
- St. Michael's Hospital : Consultant Physician Division of Endocrinology and Metabolism
- Canadian Cardiovascular Society 2015 Dyslipdemia Guidelines Update : Expert Committee Member
- Diabetes Nutrition Study Group of the European Association for the Study of Diabetes : Executive Board Member
- 33rd International Symposium on Diabetes and Nutrition : Co-chair
- Carbohydrate Committee International Life Science Institute North America : Scientific Advisor
- Food Nutrition and Safety Panel (FNSP) International Life Science Institute North America : Scientific Advisor
- Canadian Diabetes Association 2013 Clinical Practice Guidelines for Nutrition therapy : Expert Committee Member and Chapter Author
- Transcultural Diabetes & Nutrition Algorithm : Expert Committee Member
- American Journal of Clinical Nutrition : Editorial Board Member
- Nutrients (Journal) : Editorial Board Member
- Frontiers in Nutrition - Nutrition Methodology (Journal) : Associate Editor
- Canadian Diabetes Association : Member
- American Society of Nutrition : Member
- Canadian Association of Medical Biochemists : Member
- Diabetes and Nutrition Study Group of the European Association for the Study of Diabetes : Member
Media Appearances (5)
Is Food Guide past its best-before date?
The Hamilton Spectator online
Fats are absent — and they shouldn't be, some experts say — especially with emerging evidence showing it is not fat that's bad, but the food it comes from. Even the science behind it is under scrutiny's lens, says physician and University of Toronto nutritional sciences associate professor Dr. John Sievenpiper. "A big critique right now is that we don't measure well," he says. "We lack the big trials ... the randomized trials."...
Health Canada to re-examine every facet of Canada’s Food Guide
Toronto Star online
Even the science behind it is under scrutiny’s lens, says physician and University of Toronto nutritional sciences associate professor Dr. John Sievenpiper. “A big critique right now is that we don’t measure well,” he says. “We lack the big trials … the randomized trials.”...
Juicing 3.0: Cold-pressed juice takes over Toronto
The Toronto Star online
Juice may well deliver nutrients to the body quicker than whole fruits and vegetables, says physician and University of Toronto nutritional sciences associate professor Dr. John Sievenpiper, but speed may not be such a good thing. “You may not want energy delivered that fast,” he says. “We’re not all running marathons.”...
Doctors’ Notes: What the food experts eat, and what they skip
The Toronto Star online
I try to eat nuts every day. They’re heart-healthy, high in good fats and low in bad ones. They’re very filling, but not as fattening as people think — our research shows that about 20 per cent of the calories pass right through you. And they’re versatile. I throw nuts in salads and stir-fries, or just eat a small handful for a snack. I don’t nitpick about the health benefits of individual nuts; they’re all great...
Tree nuts appear to help blood sugar levels in people with Type 2 diabetes
The best results were seen when tree nuts replaced refined carbohydrates rather than saturated fats, said Dr. John Sievenpiper, a physician and researcher in the Clinical Nutrition and Risk Factor Modification Centre of St. Michael's Hospital. The results of his study were published today in the online journal PLOS ONE...
Previous research on the effect of replacing sources of animal protein with plant protein on glycemic control has been inconsistent. We therefore conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) to assess the effect of this replacement on glycemic control in individuals with diabetes...
Debate over the role of fructose in mediating cardiovascular risk remains active. To update the evidence on the effect of fructose on established therapeutic lipid targets for cardiovascular disease (low‐density lipoprotein cholesterol [LDL]‐C, apolipoprotein B, non‐high‐density lipoprotein cholesterol [HDL‐C]), and metabolic syndrome (triglycerides and HDL‐C), we conducted a systematic review and meta‐analysis of controlled feeding trials.
SSBs were associated with a modest risk of developing hypertension in 6 cohorts. There is a need for high-quality randomized trials to assess the role of SSBs in the development of hypertension and its complications.
Low glycaemic index (GI) foods are recommended to improve glycaemic control in diabetes; however, Health Canada considers that GI food labeling would be misleading and unhelpful, in part, because selected studies suggest that GI values are inaccurate due to an effect of ethnicity. Therefore, we conducted a systematic review and meta-analysis to compare the GI of foods when measured in Caucasians versus non-Caucasians.
Average fructose dose in substitution and addition trials greatly exceed national levels of reported fructose intake (49 ± 1.0 g/day) (NHANES 1977–2004). Future trials using fructose doses at real world levels are needed.