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In this study Japanese researchers examined the effects of Green Tea Powder on patients with prediabetes. Sixty of these subjects aged 32-73y were split into two groups. The first group was treated with a Green Tea Extract powder supplying 544mg Polyphenols and 456mg of these Polyphenols were present as catechins (such as EGCG). They were given this daily for two months and then had a two-month period without Green Tea powder. The other group did exactly the opposite, two months without and the final two months with Green Tea powder.
The Green Tea powder reduced hemoglobin A1c levels significantly and improved diastolic blood pressure in patients with borderline diabetes. The study is published in the June 6th, 2007 issue of the European Journal of Clinical Nutrition.