There's a lot of crazy publicity happening for foods and drinks that are supposed to boost your diet. Well, the Center for Science and Public Interest (CSPI), a non-profit food watch dog group, is out there to protect you from corporate America's crafty advertising and marketing. They just sent a serious warning to Coke and Nestle the makers of Enviga - their new negative calorie drink. 
CSPI says they will sue the companies if they continue to market the drink with fraudulent calorie burning and weight loss claims, since the science behind the drinks is a little flimsy. The lawsuit would seek to stop the deceptive marketing behind the product that is to launch nationwide early next year. Plus the amount of caffeine in one can of Enviga is almost equal to that of 3 cans of coke.
Fit's tip: Stick to water. It has zero calories, is free (not $1.29 a can like Enviga) and it is great for you.
These drinks are really total garbage. Some of them taste good, i.e. Nutrisoda (which has a lot of vitamins and minerals in it), but others like this are realy just devoid of any nutritional value whatsoever. It's just flavored green tea with an extra shot of caffeine- I can't believe people even believe this stuff.
1Our law school caf has started selling it because they think all the first years studying for finals will be buying it up like crazy (and they have an exclusive contract with Coca Cola). Frankly, we're all pretty disgusted- especially given that last year, someone passed out from drinking like 10 cans of red bull per day.
You'd be better off just having a cup of coffee with your healthy meal! This stuff cant' make you lose weight! Eating something without trans fats, on the other hand, might.