Consumers are turning away from pricier Starbucks coffee, McDonald's Big Mac meals, Doritos chips, Monster energy drinks and Heineken beer. But they can't stop guzzling Coke and Dr Pepper.

Here’s what’s different between the most popular varieties of Coca-Cola, plus which ones are likely to cause the fewest ...

Diet Coke has 46 milligrams of caffeine per 12-ounce can, compared to Coke Zero Sugar's 34 milligrams. This means Diet Coke contains over 30% more caffeine than Coke Zero Sugar.

Shelves in a grocery store stacked with bottles of Coke Zero and Diet Coke. - MDV Edwards/Shutterstock Coca-Cola has been a classic soft drink for more than a century. The first glass of the soda ...