In February 2007, the watchdog group Center for Science in the Public Interest (CSPI) filed a lawsuit over company claims that Enviga acts as a calorie-burning and weight-loss product, as a "negative calorie" drink. The group claims that if Coca-Cola and Nestlé stop marketing the product as a calorie-burner, they would drop possible litigation. The beverage makers responded that they have deliberately avoided claims that Enviga is a weight-loss product, and that there exists independent research to substantiate the effects of the product. The watchdog group alleged that it was only a 3-day study, and that it was only presented in a conference by the Obesity Society, the editors of journal "Obesity", where their conclusions were rejected. The lack of validity of the study was later referred to by the Attorney General in the settlement. Studies on the combination of caffeine and green tea anti-oxidant have given mixed results, and the results are not conclusive.