Get rid of obesity with soft drink ENVIGA?

To get results 3 cans worth $4 of Enviga are necessary demanding for a budget of $120/month.
Tap water can be as healthy, green tee without sugar can be more delicious, and some exercise can burn more extracalories than ENVIGA does. What´s your opinion on this?
Here is the ENVIGA story:

Nestlé and CocaCola advertising weight control
ENVIGA

Servane Rudelle and colleagues 2007 studied the effect on weight control of a beverage containing EGCG, green tea and caffeine. The authors found an increase in 24-hour energy expenditure of 100 kcal/d on account of this beverage.

The weight gain of the American population is slightly less than 1 kg/yr, which represents a median excess energy of 15 kcal/d, and because energy is stored with 50% efficiency, a negative energy balance of 100 kcal/d would be sufficient to prevent weight gain in most of the U.S. population The authors conclude that consuming this type of beverage regularly together with exercise, may be helpful in weight control. http://www.enviga.com/_doc/nestle_clinical_study.pdf

Based on this study Nestlé and CocaCola launched its ENVIGA product advertising adds: Benefits: "burn more calories" "drink negative" http://www.enviga.com/

The Center for Science in the Public Interest CSPI Says “Calorie Burning” and Weight Loss Claims Illegal
The Federal Trade Commission (FTC) should take enforcement action against Coca-Cola and Nestlé for their unlawful deceptive advertising for Enviga, their green-tea-flavored diet soda, according to a complaint filled with the agency on May 2007 by the nonprofit Center for Science in the Public Interest (CSPI). At issue is the companies' claim that Enviga burns more calories than the five calories per can it delivers, which, CSPI says, strongly implies weight loss. http://cspinet.org/new/pdf/enviga_ftc.pdf