Do you know how much caffeine you take in every day? Though every caffeinated food and drink has some capacity to keep you wired and alert, their levels vary greatly. Take coffee, for example. According to the U.S. Center for Science in the Public Interest, the amount of caffeine in a 12 oz. (355 ml) cup of brewed can run as little as 100 mg (for Maxwell House) and as high as 260 mg (for Starbucks), while a shot of espresso contains 60 mg. Even decaf coffee has some caffeine—as much as 25 mg, in some cases. That's even higher than the caffeine in a Hershey's Special Dark Chocolate Bar, which is only 20 mg.
If you switch from coffee to black tea, you'll get a lower dose of caffeine, as there's only around 40 to 120 mg of caffeine in a 12 oz. (355 ml) cup. Be careful of Diet Coke, though—it might have fewer calories, but at 47 mg per can, its caffeine content is actually higher than Coca-Cola's 35 mg. But what if you want more, not less? A 16 oz. (473 ml) energy drink has anywhere from 160 mg (NOS Energy Drink) to 357 mg (Bang Energy Drink), and there's a whopping 200 mg of caffeine in one caplet of NoDoz. Explore the science of caffeine with the videos below.