Cited by 201Nutritional Studies and DietDiabetes, Cardiovascular Risks, and LipoproteinsDiet and metabolism studies

Effect of vegetarian dietary patterns on cardiometabolic risk factors in diabetes: A systematic review and meta-analysis of randomized controlled trials

Viguiliouk, Effie, Kendall, Cyril WC., Kahleová, Hana, Rahelić, Dario, Salas-Salvadó, Jordi, Choo, Vivian L., Mejia, Sonia Blanco, Stewart, Sarah E. +3 more·2019·Clinical Nutrition

Abstract

Background & aims To update the European Association for the Study of Diabetes (EASD) clinical practice guidelines for nutrition therapy, we conducted a systematic review and meta-analysis of randomized controlled trials to summarize the evidence for the effect of vegetarian dietary patterns on glycemic control and other established cardiometabolic risk factors in individuals with diabetes.Methods We searched MEDLINE, EMBASE, and Cochrane databases through February 26, 2018 for randomized controlled trials ≥3 weeks assessing the effect of vegetarian dietary patterns in individuals with diabetes. The primary outcome was HbA 1c. Secondary outcomes included other markers of glycemic control, blood lipids, body weight/adiposity, and blood pressure. Two independent reviewers extracted data and assessed risk of bias. Data were pooled by the generic inverse variance method and expressed as mean differences (MD) with 95% CIs. Heterogeneity was assessed (Cochran Q statistic) and quantified (I 2 statistic). The overall certainty of the evidence was assessed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach.Results Nine trials (n = 664 participants) met the eligibility criteria. Vegetarian dietary patterns significantly lowered HbA 1c (MD = -0.29% [95% CI: -0.45, -0.12%]), fasting glucose (MD = -0.56 mmol/L [95% CI: -0.99, -0.13 mmol/L]), LDL-C (MD = -0.12 mmol/L [95% CI: -0.20, -0.04 mmol/L]), non-HDL-C (MD = -0.13 mmol/L [95% CI: -0.26, -0.01 mmol/L]), body weight (MD = -2.15 kg [95% CI: -2.95, -1.34 kg]), BMI (MD = -0.74 kg/m 2 [95% CI: -1.09, -0.39 kg/m 2]) and waist circumference (MD = -2.86 cm [95% CI: -3.76, -1.96 cm]). There was no significant effect on fasting insulin, HDL-C, triglycerides or blood pressure. The overall certainty of evidence was moderate but was low for fasting insulin, triglycerides and waist circumference.Conclusion Vegetarian dietary patterns improve glycemic control, LDL-C, non-HDL-C, and body weight/adiposity in individuals with diabetes, supporting their inclusion for diabetes management. More research is needed to improve our confidence in the estimates. CLINICALTRIALS.Gov identifier NCT02600377.

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Crossref · 10.1016/j.clnu.2018.05.032

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  • In the Look AHEAD trial, individuals following a calorie-restricted low-fat eating pattern in a structured weight loss program using meal replacements achieved moderate success compared with the control condition eating plan.

    “individuals following a calorie-restricted low-fat eating pattern, in the context of a structured weight loss program using meal replacements, achieved moderate success compared with the control condition eating plan (101).”
  • Benefit from a low-fat eating pattern appears to be mostly related to weight loss as opposed to the eating pattern itself.

    “Bene fi t from a low-fat eating pattern appears to be mostly related to weight loss as opposed to the eating pattern itself (100,101).”
  • A larger body of evidence from randomized clinical trials suggests that vegetarian and other plant-based dietary patterns lower weight and improve lipid management, glucose metabolism, blood pressure, and cardiometabolic health.

    “A larger body of evidence from randomized clinical trials suggests that vegetarian and other plant-based dietary patterns lower weight29,30,31 and improve lipid management,30,32,33 glucose metabolism,33,34 blood pressure,35,36,37 and cardiometabolic health.38”
  • In the Look AHEAD trial, the intensive lifestyle intervention resulted in 8.6% weight loss at 1 year, and downstream therapeutic benefits were far-ranging even though benefits were not seen for the primary cardiovascular outcomes.

    “The intensive lifestyle intervention resulted in 8.6% weight loss at 1 year, and the downstream therapeutic benefi ts were far-ranging even though bene fi ts were not seen for the primary cardiovascular outcomes (100).”
  • High-MUFA and vegetarian diets showed greater weight losses, by −1.6 to −2 kg, than control diets.

    “High-monounsaturated-fatty-acid (MUFA) [29] and vegetarian diets [35] showed greater weight losses, by −1.6 to −2 kg, than the control diets.”

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Authors
Viguiliouk, E., Kendall, C. W., Kahleová, H., Rahelić, D., Salas-Salvadó, J., Choo, V. L., Mejia, S. B., Stewart, S. E., Leiter, L. A., Jenkins, D. J., & Sievenpiper, J. L.
Affiliations
  • St. Michael's Hospital (CA)
  • Physicians Committee for Responsible Medicine (US)
  • University Hospital Dubrava (HR)
Corresponding author
Sievenpiper, John L.
Venue
Clinical Nutrition
Publisher
Elsevier BV
Published
2019-06
Volume
38
Issue
3
Pages
1133-1145
ISSN
0261-5614 (ISSN-L)
OpenAlex
W2807837295
Cited by
201
References
78
Citations by year
2026: 17 · 2025: 21 · 2024: 30 · 2023: 29 · 2022: 27 · 2021: 32 · 2020: 26 · 2019: 18 · 2018: 1
FWCI
3.49
Type
journal article
Language
en
Open access
closed
Locations
  • Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canadian Institutes of Health Research (129920)
  • Institute of Nutrition, Metabolism and Diabetes
  • Canadian Society of Endocrinology and Metabolism
  • Banting and Best Diabetes Centre, University of Toronto
  • Peanut Institute
  • Government of Canada
  • Flax Council of Canada
  • National Dried Fruit Trade Association
  • Griffin Hospital
  • St. Michael's Hospital Foundation
  • Canola Council of Canada
  • Ministerio de Ciencia y Tecnología
  • Abbott Laboratories
  • Departament de Salut, Generalitat de Catalunya
  • Eli Lilly and Company
  • Bayer
  • Ontario Ministry of Research, Innovation and Science
  • Instituto de Salud Carlos III
  • Hospital for Sick Children
  • European Commission
  • Canada Research Chairs
  • Danone Institute of Canada
  • Canada Foundation for Innovation
  • Physicians' Services Incorporated Foundation
  • California Strawberry Commission
  • Meso Scale Diagnostics
  • Unilever
  • Canadian Diabetes Association
  • Arizona State University
  • Johnson and Johnson
  • Novartis
  • Coca-Cola
  • Canadian Agri-Food Policy Institute
  • PepsiCo
  • General Mills
  • Kellogg's
  • Instituto Danone
  • Novo Nordisk Canada
  • Alpro Foundation
  • International Nut and Dried Fruit Council
  • Ontario Research Foundation
  • Saskatchewan Pulse Growers
  • Pfizer Canada
  • Canadian Nutrition Society
  • Institute of Food Technologists
  • Almond Board of California
  • AstraZeneca Canada
  • Merck Sharp and Dohme
  • Amgen Canada
  • Cognitive Neuroscience Society
  • Advanced Foods and Materials Network
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
Keywords
vegetarian diet, diabetes mellitus, glycemic control, HbA1c, fasting blood glucose, LDL cholesterol, non-HDL cholesterol, body weight, adiposity, waist circumference, blood pressure, fasting insulin, triglycerides, cardiometabolic risk factors, nutritional therapy, dietary intervention, randomized controlled trials, GRADE certainty of evidence, plant-based diet
MeSH terms
Adolescent, Adult, Blood Pressure, Body Weight, Diabetes Mellitus, Female, Humans, Lipids, Male, Middle Aged, Obesity, Diet, Vegetarian, Randomized Controlled Trials as Topic, Young Adult

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