Coffee contains caffeine, which is the most commonly consumed psychoactive substance in the world. Caffeine is also included in most commercial fat-burning supplements today — and for good reason. Moreover, it's one of the few substances known to help mobilize fats from your fat tissues and increase...

There are few things in the food world that evoke stronger opinions than spice. Do you go for the mild salsa, the medium, or the three-alarm hot version? Fortunately for people who do love spice (and not just the fiery spice from capsaicin found in chili peppers),...