In the first study, 12 healthy men performed a 30-minute cycling exercise before and after taking green tea extract. In the second, 11 healthy men took an oral-glucose-tolerance test before and after taking green tea extract. In both cases, their results improved after consuming the tea.
On average, fat oxidation rates were 17 percent higher, and insulin sensitivity 13 percent higher, after participants drank green tea extract, compared with taking a placebo.
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