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Effect of Ginger (Zingiber Officinale) on Blood Glucose and Lipid Concentrations in Diabetic and Hyperlipidemic Subjects: A Meta-Analysis of Randomized Controlled Trials Publisher



Jafarnejad S1 ; Keshavarz SA1 ; Mahbubi S2 ; Saremi S3 ; Arab A4 ; Abbasi S5 ; Djafarian K1
Authors
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Authors Affiliations
  1. 1. Department of Clinical Nutrition, School of Nutritional Sciences and Dietetic, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Community Nutrition, Shiraz University of Medical Sciences, Shiraz, Iran
  3. 3. Department of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. Faculty of Public Health, Kermanshah University of Medical Science, Kermanshah, Iran

Source: Journal of Functional Foods Published:2017


Abstract

Objective The aim of our study was to assess the effect of ginger (Zingiber officinale) on blood glucose and lipid concentration in subjects with diabetes or hyperlipidemia. Methods The literature search was conducted in PubMed and Scopus up to 30 October 2016. A total of nine randomized controlled trials were included in the meta-analysis. Weighted mean difference (WMD) and its 95% confidence interval were calculated for net changes in blood glucose (fasting blood-glucose [FBG]) and lipid concentrations (total cholesterol [TC], triglyceride [TG], low-density lipoprotein cholesterol [LDL-C], high density lipoprotein cholesterol [HDL-C]). Subgroup analyses were performed by clinical condition (hyperlipidemia and T2DM) and quality assessment (high and low quality). Results Compared to the controls, ginger intake significantly reduced the concentrations of TG (WMD, −8.84; 95% CI: −11.95 to −5.73), TC (WMD, −4.42; 95% CI: −8.70 to −0.13), HDL-C (WMD, 2.87; 95% CI: 0.88–4.86) and FBG (WMD = −14.93; 95% CI: −19.83 to −10.04). Subgroup analyses by clinical condition of hyperlipidemia and high quality studies showed consistent results with the overall analysis, whereas, the subgroup analysis by clinical condition of diabetes showed a significant difference in the mean change of TG and FBG levels. Moreover, the high risk studies showed a significant change in the mean of FBG. Examining the funnel plot, suggests no publication bias. Conclusions Ginger supplementation (tablet, capsules, powder or rhizomes) significantly reduced FBG, TG and TG and significantly increased HDL-C. But the changes were related to the clinical condition. More clinical trials evaluating the effects of ginger are warranted. © 2016 Elsevier Ltd
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