Before you pop that top, do you know what's lurking in that tall cool one? When it comes to beverages, sodas are public enemy number one. They may seem inconsequential, but it's hard to believe how quickly the numbers add up. A 12-ounce can of cola contains 144 calories. {relatedarticles}If you consume at least three sodas a day, that's a total of 432 calories. {relatedarticles}Then there's the sugar aspect. One 12-ounce can of soda has a whopping 39 grams of sugar. That's the equivalent to almost 10 teaspoons of sugar. With a 2,000 calorie a day diet, you should be consuming no more than 32 grams of sugar. Even diet sodas are dangerous. Although they boast 0 calories, studies show that diet sodas with artificial sweeteners actually cause people to gain more weight.