Green Tea Extract Increases Metabolism,
May Aid in Weight Loss
There are two ways to lose weight -- either reduce energy intake, or increase energy
expenditure. Because hypothyroidism -- even after treatment -- may reduce energy expenditure in some
people, patients naturally are looking for options that can help safely help raise the metabolism.
In a study reported on in the American Journal of Clinical Nutrition, it was found that green tea
extract resulted in a significant increase in energy expenditure (a measure of metabolism), plus also had a
significant effect on fat oxidation. While some of the effects were originally theorized to be due to the caffeine
content of green tea, the researchers discovered that the tea actually has properties that go beyond those that
would be explained by the caffeine.
The same amount of caffeine as was in the green tea, administered alone, failed to change energy
expenditure in other studies. This led reseachers to believe that there is some interaction going on with the
active ingredients of green tea that promotes increased metabolism and fat oxidation.
The researchers indicated that their findings have substantial implications for weight control. A
4% overall increase in 24-hour energy expenditure was attributed to the green tea extract, however, the research
found that the extra expenditure took place during the daytime. This led them to conclude that, since thermogenesis
(the body's own rate of burning calories) contributes 8-10% of daily energy expenditure in a typical cubject, that
this 4% overall increase in energy expenditure due to the green tea actually translated to a 35-43% increase in
The Shocking Truth