Maybe it's the sleepless nights. Maybe it's the daytime jitters. Whatever the reason, many people decide to cut back on caffeine -- only to find that it's harder than they thought.
Caffeine turns up in expected places, in unexpected amounts. And recent years have seen an explosion in the number of caffeinated products on the market: energy drinks, of course, but also chewing gum, candy bars and (for a brief while) potato chips. A lack of labeling guidelines leaves many consumers in the dark about just how much caffeine the products contain.