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Effects of green tea catechins with or without caffeine on glycemic control in adults: a meta-analysis of randomized controlled trials

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Zheng, Xin-Xin, Xu, Yan-Lu, Li, Shao-Hua, Hui, Rutai, Wu, Yong-Jian, Huang, Xiao-Hong·2013·The American Journal of Clinical Nutrition

DOI 10.3945/ajcn.111.032573

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Abstract

Background The effect of green tea catechins (GTCs) with or without caffeine on glycemic control is controversial.Objective We aimed to identify and quantify the effects of GTCs or GTC-caffeine mixtures on glucose metabolism in adults.Design A comprehensive literature search was conducted to identify relevant trials of GTCs with or without caffeine on markers of glycemic control [fasting blood glucose (FBG), fasting blood insulin (FBI), glycated hemoglobin (Hb A1c), and homeostatic model assessment of insulin resistance (HOMA-IR)]. Weighted mean differences were calculated for net changes by using fixed-effects models. Prespecified subgroup analyses were performed to explore the influence of covariates on net changes in FBG and FBI concentrations.Results Twenty-two eligible randomized controlled trials with 1584 subjects were identified. Pooled analyses showed that FBG (-1.48 mg/dL; 95% CI: -2.57, -0.40 mg/dL) decreased significantly with GTCs with or without caffeine, whereas FBI (0.04 μU/mL; 95% CI: -0.36, 0.45 μU/mL), Hb A1c (-0.04%; 95% CI: -0.15, 0.08%), and HOMA-IR (-0.05; 95% CI: -0.37, 0.26) did not. Subgroup analyses indicated that the glucose-lowering effect was apparent when the duration of follow-up was over a median of 12 wk. Overall, no significant heterogeneity was detected for FBG, FBI, Hb A1c, or HOMA-IR.Conclusions The meta-analysis showed that the administration of GTCs with or without caffeine resulted in a significant reduction in FBG. The limited data available on GTCs did not support a positive effect on FBI, Hb A1c, or HOMA-IR. Thus, more large and well-designed trials are needed in the future. This trial was registered at http://www.crd.york.ac.uk/prospero as CRD42012002139.

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Authors: Zheng, X.-X., Xu, Y.-L., Li, S.-H., Hui, R., Wu, Y.-J., & Huang, X.-H.
Affiliations: Chinese Academy of Medical Sciences & Peking Union Medical College (CN)
ORCID: Hui, Rutai
Venue: The American Journal of Clinical Nutrition
Publisher: Elsevier BV
Published: 2013-04
Volume: 97
Issue: 4
Pages: 750-762
ISSN: 0002-9165 (ISSN-L)
DOI: 10.3945/ajcn.111.032573
OpenAlex: W2137040425
Cited by: 146
References: 69
Citations by year: 2026: 7 · 2025: 3 · 2024: 11 · 2023: 7 · 2022: 11 · 2021: 10 · 2020: 21 · 2019: 13 · 2018: 11 · 2017: 15 · 2016: 13 · 2015: 7 · 2014: 9 · 2013: 8
FWCI: 1.81
Type: journal article
Language: en
Open access: bronze
doi.org
Licence: www.elsevier.com/tdm/userlicense/1.0/ (tdm)
www.elsevier.com/legal/tdmrep-license (tdm)
www.elsevier.com/open-access/userlicense/1.0/ (vor, 3612 d)
Locations: American Journal of Clinical Nutrition (publishedVersion)
PubMed (publishedVersion)
Topics: Life Sciences › Agricultural and Biological Sciences › Food Science › Tea Polyphenols and Effects
Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Natural Antidiabetic Agents Studies
Health Sciences › Medicine › Pharmacology (medical) › Coffee research and impacts
Keywords: green tea catechins, caffeine, glycemic control, fasting blood glucose, fasting insulin, HbA1c, insulin resistance, glucose metabolism, type 2 diabetes
MeSH terms: Adult, Blood Glucose, Caffeine, Catechin, Glycated Hemoglobin, Humans, Hyperglycemia, Hypoglycemic Agents, Insulin, Insulin Resistance, Phytotherapy, Metabolic Diseases, Plant Extracts, Camellia sinensis

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Effects of green tea catechins with or without caffeine on glycemic control in adults: a meta-analysis of randomized controlled trials

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