Cited by 215Food composition and propertiesNutritional Studies and DietDiabetes Treatment and Management

Effect of low glycaemic index or load dietary patterns on glycaemic control and cardiometabolic risk factors in diabetes: systematic review and meta-analysis of randomised controlled trials

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Chiavaroli, Laura, Lee, Danielle, Ahmed, Amna, Cheung, Annette, Khan, Tauseef A, Blanco, Sonia, Mejia, Mirrahimi, Arash +8 more·2021·BMJ

Abstract

OBJECTIVE: To inform the update of the European Association for the Study of Diabetes clinical practice guidelines for nutrition therapy. DESIGN: Systematic review and meta-analysis of randomised controlled trials. DATA SOURCES: Medline, Embase, and the Cochrane Library searched up to 13 May 2021. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Randomised controlled trials of three or more weeks investigating the effect of diets with low glycaemic index (GI)/glycaemic load (GL) in diabetes. OUTCOME AND MEASURES: The primary outcome was glycated haemoglobin (HbA1c). Secondary outcomes included other markers of glycaemic control (fasting glucose, fasting insulin); blood lipids (low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C), non-HDL-C, apo B, triglycerides); adiposity (body weight, BMI (body mass index), waist circumference), blood pressure (systolic blood pressure (SBP) and diastolic blood pressure (DBP)), and inflammation (C reactive protein (CRP)). DATA EXTRACTION AND SYNTHESIS: Two independent reviewers extracted data and assessed risk of bias. Data were pooled by random effects models. GRADE (grading of recommendations assessment, development, and evaluation) was used to assess the certainty of evidence. RESULTS: 29 trial comparisons were identified in 1617 participants with type 1 and 2 diabetes who were predominantly middle aged, overweight, or obese with moderately controlled type 2 diabetes treated by hyperglycaemia drugs or insulin. Low GI/GL dietary patterns reduced HbA1c in comparison with higher GI/GL control diets (mean difference −0.31% (95% confidence interval −0.42 to −0.19%), P<0.001; substantial heterogeneity, I2=75%, P<0.001). Reductions occurred also in fasting glucose, LDL-C, non-HDL-C, apo B, triglycerides, body weight, BMI, systolic blood pressure (dose-response), and CRP (P<0.05), but not blood insulin, HDL-C, waist circumference, or diastolic blood pressure. A positive dose-response gradient was seen for the difference in GL and HbA1c and for absolute dietary GI and SBP (P<0.05). The certainty of evidence was high for the reduction in HbA1c and moderate for most secondary outcomes, with downgrades due mainly to imprecision. CONCLUSIONS: This synthesis suggests that low GI/GL dietary patterns result in small important improvements in established targets of glycaemic control, blood lipids, adiposity, blood pressure, and inflammation beyond concurrent treatment with hyperglycaemia drugs or insulin, predominantly in adults with moderately controlled type 1 and type 2 diabetes. The available evidence provides a good indication of the likely benefit in this population. STUDY REGISTRATION: ClinicalTrials.gov NCT04045938.

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  1. [44]Borenstein M Hedges LV Higgins JPT Rothstein HR. Introduction to metaanalysis. Wiley, 2008.
  2. [55]Collier GR Giudici S Kalmusky J. Low glycaemic index starchy foods improve glucose control and lower serum cholesterol in diabetic children. Diabetes Nutr Metab 1988; 1: 11- 9.
  3. [57]Fontvieille AM Acosta M Rizkalla SW. A moderate switch from high to low glycaemic-index foods for 3 weeks improves the metabolic control of Type 1 (IDDM) diabetic subjects. Diabetes Nutr Metab 1988; 1: 139- 43.

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Authors
Chiavaroli, L., Lee, D., Ahmed, A., Cheung, A., Khan, T. A., Blanco, S., Mejia, Mirrahimi, A., Jenkins, D. J. A., Livesey, G., Wolever, T. M. S., Rahelić, D., Kahleová, H., Salas-Salvadó, J., Kendall, C. W. C., & Sievenpiper, J. L.
Affiliations
  • St. Michael's Hospital (CA)
  • University of Toronto (CA)
  • University of Zagreb (HR)
  • Physicians Committee for Responsible Medicine (US)
Corresponding author
Sievenpiper, John L
Venue
BMJ
Publisher
BMJ
Published
2021-08-04
Volume
374
Pages
n1651
ISSN
1756-1833 (ISSN-L)
OpenAlex
W3188491684
Cited by
215
References
100
Citations by year
2026: 29 · 2025: 51 · 2024: 50 · 2023: 38 · 2022: 41 · 2021: 5
FWCI
4.46
Type
journal article
Language
en
Open access
Locations
  • BMJ (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Rovira & Virgili repository (submittedVersion, cc-by)
Funders
  • U.S. Department of Agriculture
  • American Association for the Advancement of Science
  • Amgen
  • Eli Lilly and Company
  • Pfizer
  • AstraZeneca
  • Sanofi
  • PepsiCo
  • General Mills
  • Arizona State University
  • Danone
  • Almond Board of California
  • Dairy Farmers of Canada
  • United Soybean Board
  • Canadian Cardiovascular Society
  • Diabetes Canada (129920)
  • European Food Safety Authority
  • Glycemic Index Foundation
  • Canadian Nutrition Society
  • Canola Council of Canada
  • Alberta Pulse Growers Commission
  • Loblaw Companies Limited
  • Peanut Institute
  • Mylan
  • Physicians Committee for Responsible Medicine
  • National Honey Board
  • Physicians' Services Incorporated Foundation
  • Royal Society
  • Diabetes UK
  • Society for Endocrinology
  • British Nutrition Foundation
  • European Commission
  • Generalitat de Catalunya
  • University of Toronto
  • Institució Catalana de Recerca i Estudis Avançats
  • Novo Nordisk
  • Mitacs
  • Hospital for Sick Children
  • European Association for the Study of Diabetes
  • Instituto Danone
  • International Nut and Dried Fruit Council
  • International Sweeteners Association
  • Merck Sharp and Dohme
  • Health Canada
  • Canadian Institutes of Health Research (129920)
  • Agriculture and Agri-Food Canada
  • Banting and Best Diabetes Centre, University of Toronto
  • Medical Research Council
  • Instituto de Salud Carlos III
  • Obesity Canada
  • Ontario Ministry of Research and Innovation
  • Institute of Nutrition, Metabolism and Diabetes (129920)
  • Eurostars
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
low glycemic index diet, type 1 diabetes, type 2 diabetes, glycemic control, HbA1c, cardiometabolic risk factors, LDL cholesterol, triglycerides, blood pressure, body weight, C-reactive protein, inflammation, nutritional therapy, dose-response relationship, dietary habits, serum lipids, adiposity
MeSH terms
Glycemic Load, Cardiometabolic Risk Factors, Glycemic Control, Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Diet, Diabetic, Humans, Glycemic Index

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