Effect of green tea catechins with or without caffeine on glycemic control in adults: a meta-analysis of randomized controlled trials
Zheng XX, Xu YL, Li SH, Hui R, Wu YJ, Huang XH
Published in American Journal of Clinical Nutrition
Methodology
Meta-analysis of 17 randomised controlled trials of green tea catechins on fasting glucose, insulin and HbA1c
Key Findings
Green tea catechins reduced fasting glucose by 1.48 mg/dL and HbA1c by 0.30%, with no significant effect on fasting insulin or HOMA-IR.
Conclusions
Green tea has small favourable effects on glycaemic control that are unlikely to be clinically decisive alone.
Limitations
Modest effect sizes; heterogeneity in catechin dose and baseline glycaemia.
Supplements Studied
Green tea catechins significantly reduced fasting glucose and HbA1c, with no significant effect on fasting insulin or HOMA-IR.
Outcomes Measured
Green tea catechins significantly reduced fasting glucose and HbA1c concentrations.
Study Details
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