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Old 04-04-2008, 07:49 PM
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Default Green Tea May Burn Fat and Improve Insulin Sensitivity

Green tea increases fat burning and improves insulin sensitivity in men

The March, 2008 issue of the American Journal of Clinical Nutrition reported on two crossover studies conducted by researchers at the University of Birmingham in England which found that an extract of green tea improves the ability of healthy men to burn fat during exercise, and also improves insulin sensitivity.

The first study included 12 young men who engaged in 30 minutes of cycling before and after supplementing with a placebo or 3 capsules of decaffeinated green tea extract. Each capsule of green tea extract contained a total of 340 milligrams polyphenols, and 136 milligrams epigallocatechin gallate (EGCG), an amount equivalent to that provided by approximately 3.5 cups green tea.

Blood samples were drawn before the participants began cycling, and at ten minute intervals throughout the exercise period. Expiratory breath sampling was conducted every two minutes. Carbohydrate and fat oxidation rates were calculated from the volume of oxygen consumed per minute and the rate of carbon dioxide production.

In the second study, 11 men received 3 green tea extract capsules or a placebo prior to ingesting a 25 percent glucose beverage. Blood samples collected prior to administration of the glucose, and at 15, 30, 4, 69, 90 and 120 minutes were tested for plasma glucose, glycerol, and serum insulin.

The first study found that green tea extract increased whole-body fat oxidation significantly more than the placebo, as well as increasing the contribution of fat oxidation to total energy expenditure. In the second study, green tea improved insulin sensitivity by 13 percent.

"Acute ingestion of green tea can increase fat oxidation during moderate-intensity exercise, possibly through an increase in lipolysis and therefore an increased availability of fat as a fuel," the authors conclude.

"Green tea ingestion can also improve glycemic control after an oral glucose load and could have the potential to reduce the risk of type 2 diabetes mellitus."
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