Some controlled trials show that green tea can cause mild reductions in blood sugar
levels. It may also lower the risk of developing type 2 diabetes.
This meta-analysis suggested that green tea had favorable effects, ie, decreased fasting
glucose and Hb A1c concentrations. Subgroup analyses showed a significant reduction in
fasting insulin concentrations in trials with high Jadad scores.
https://www.ncbi.nlm.nih.gov/pubmed/23803878
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