Nice try Coke! But if any overweight people wants to solely relying on tis type of drinks to return to normal weight, it might be too cost prohibitive.

A soft drink that burns calories? Coca-Cola Co. has just introduced one. But don't throw away your Weight Watchers plan.

In a conference call this week, the Atlanta beverage giant unveiled plans to launch Enviga, a sparkling green tea-based soft drink infused with a tantalizing claim: Consume three 12-ounce cans of Enviga over a 24-hour period, and a healthy person of normal weight can burn anywhere from 60 to 100 additional calories. Coke developed the beverage in partnership with Nestlé SA.

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Assuming the calorie-burning benefit is real, Enviga raises another question: Is it worth the $1.29 to $1.49 price of a 12-ounce can? Assuming a 60-calorie loss from three cans of the drink, a person would have to drink more than five cans a day of Enviga, at a cost of $6.45 or more, to burn the number of calories found in two Oreos. A brisk 15-minute walk would do the same trick. To accomplish a more substantial health benefit -- such as erasing the effects of a McDonald's Big Mac -- a person would need to drink about 28 cans of Enviga, at a cost of $36 or more.

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Rhona Applebaum, Coke's chief scientist, agrees that the new drink is not a diet pill. "This is not a magic bullet," she says. Enviga should be consumed as part of a healthy diet and regular physical activity, she says. Enviga "gently invigorates your metabolism. It gives your body this extra boost."