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  • Title: Effect of vegetarian dietary patterns on cardiometabolic risk factors in diabetes: A systematic review and meta-analysis of randomized controlled trials.
    Author: Viguiliouk E, Kendall CW, Kahleová H, Rahelić D, Salas-Salvadó J, Choo VL, Mejia SB, Stewart SE, Leiter LA, Jenkins DJ, Sievenpiper JL.
    Journal: Clin Nutr; 2019 Jun; 38(3):1133-1145. PubMed ID: 29960809.
    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 HbA1c. 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 (I2 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 HbA1c (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/m2 [95% CI: -1.09, -0.39 kg/m2]) 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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