From CAM Report-

Researchers in Chongqing, People’s Republic of China, evaluated the effect of green tea on glucose control and insulin sensitivity.

First, the details.

• 17 studies with data from 1133 people were included in the meta-analysis.
• Jadad scores were used to assess the quality of the studies-

And, the results.

• Drinking green tea significantly reduced the fasting glucose and hemoglobin A_1c (A_1c) concentrations by -0.09 mmol/L and -0.30%, respectively.
  • Blood levels of A_1c are used to measure average blood sugar levels over prolonged periods.
• The best studies, based on high Jadad scores, showed that green tea significantly reduced fasting insulin concentrations (-1.16 ?IU/mL).

The bottom line?

The authors concluded, “This meta-analysis suggested that green tea had favorable effects, ie, decreased fasting glucose and A_1c concentrations.”

Most important is the significant reduction in A_1c achieved by green tea.