In all honesty folks, the amount of active ingredient (EGCG) that is found in one average cup of green tea is far below what is required for it to have a therapeutic (weight loss) effect. If you had 8-10 cups a day then you might be getting closer to having therapeutic doses of EGCG.
Any weight loss that apparently results from the consumption of a couple of cups of green tea a day are likely to come from the conscious (or subconscious) changes you make to your eating and exercise habits rather than the green tea itself.
Please don't get me wrong, green tea is fantastic stuff and offers a range of health benefits I just can't find any solid science that suggests weight loss coming from drinking a couple of cups a day.