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Green Tea and Weight Loss

Research shows that green tea has thermogenic properties, that is, that it increases the metabolism in the body. This in turn is linked with faster calorie burning and fat processing. Consider the academic study from researchers from the University of Geneva, who concluded1:

Green tea has thermogenic properties and promotes fat oxidation beyond that explained by its caffeine content per se. The green tea extract may play a role in the control of body composition via sympathetic activation of thermogenesis, fat oxidation, or both.

In other words, they're stating that green tea may be involved in fat burning and weight loss.

A year later, the same team of researchers concludes that the effects go above and beyond those due to green tea's small caffeine content2. They state that

[G]reen tea extract stimulates brown adipose tissue thermogenesis to an extent which is much greater than can be attributed to its caffeine content per se, and that its thermogenic properties could reside primarily in an interaction between its high content in catechin-polyphenols and caffeine.

and then conclude that

Such a synergistic interaction between catechin-polyphenols and caffeine to augment and prolong sympathetic stimulation of thermogenesis could be of value in assisting the management of obesity.

And a year after, another team of researchers from Japan concludes the same thing, that green tea has fat-burning and weight-loss properties3:

Tea catechins are thus shown to have anti-obesity effects in humans.
How much green tea is necessary for weight loss?

Research is not clear on how much is enough. In part this is because research is typically conducted with high concentrations to speed up the process and make it more pronounced during the study. In the Japanese study3 two concentrations were used: 118.5 mg and 483.0 mg of green tea extract per day. After twelve weeks, both groups showed reduction in total body mass and BMI (Body Mass Index, a measure of weight density in the body which takes into consideration a person's height and weight). The higher concentration group had further benefits, such as reductions in waist circumference, cholesterol and triacylglycerol levels.

The medical center of the University of Maryland suggests6 adults should consume 2 to 3 cups of green tea daily or 100 to 750 mg of standardized green tea extract.

Entropy contains 80 mg of green tea extract per serving (one can). Buy Entropy now.

Conclusion

Green tea has been shown to aid in weight control through its metabolism-inducing properties. Green tea has many other benefits besides its fat-burning properties. It is, after all, rich in anti-oxidants (oxidants are those nasty by-products of metabolism and unhealthy lifestyles that cause cell damage and accelerate aging).

Consuming 2-3 cups of green tea per day has multiple benefits, one of which is that it may aid those seeking to reduce weight and burn fat.

References:

[1] Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans. Dulloo AG, Duret C, Rohrer D, Girardier L, Mensi N, Fathi M, Chantre P, Vandermander J. The American journal of clinical nutrition 1999, vol. 70, num. 6, pp. 1040-1045.
[2] Green tea and thermogenesis: interactions between catechin-polyphenols, caffeine and sympathetic activity. A G Dulloo, J Seydoux, L Girardier, P Chantre and J Vandermander International Journal of Obesity. February 2000, Volume 24, Number 2, Pages 252-258.
[3] Anti-obesity Effects of Tea Catechins in Humans. Hase T. Komine Y., Meguro S., Takeda Y., Takahashi H., Matsui Y., Tokimitsu I., Shimaski H., Itakura H. Journal of Japan Oil Chemists' Society vol.50, no.7, pp 599-605(2001).
[4] Tea catechins suppress accumulation of body fat in humans. Nagao T., Meguro S., Soga S., Otsuka A., Tomonobu K., Fumoto S., Chikama A., Mori K., Yuzawa M., Watanabe H., Hase T., Tanaka Y., Tokimitsu I., Shimasaki H. and Itakura H. Journal of Oleo Science, vol. 50 (2001) , no. 9, pp. 717.
[5] Antilipogenic effect of green tea extract in C57BL/6J-Lep ob/ob mice. Kim HJ, Jeon SM, Lee MK, Jung UJ, Shin SK, Choi MS. Phytotherapy research, 2009 Apr;23(4):467-71.
[6] University of Maryland: Green Tea,