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Green tea consumption linked to decreased fasting glucose
Animal and lab studies found that green tea extract could decrease fasting glucose, A1c levels, and insulin, but clinical trial results in humans on the effect of consuming green tea or green tea extract have been inconsistent. To help clarify the issue researchers conducted a meta-analysis of 17 randomised, controlled trials that included 1 133 people. Green tea consumption was associated with decreases in fasting blood glucose and A1c levels. Sub analysis found that in high-quality studies green tea consumption was associated with reduced fasting insulin as well. The reviewer could not determine the optimal dose of green tea for improving blood glucose control.