Spices are an awesome calorie-free way to flavor your favorite lean protein. And gram-for-gram they are also some of the most potent antioxidant foods on the planet. A new study published in the Journal of Cancer Prevention found that carnosic acid, a substance found in rosemary, has a rather novel way of combating body fat. Korean researchers exposed fat cells to various concentrations of carnosic acid and found that it inhibited the growth and development of those cells. The higher the concentration of carnosic acid, the less fat the cells stored. Carnosic acid has a very high toxicity threshold and has been deemed safe by the relatively strict European Union. While it is not readily available as a stand-alone supplement, rosemary extract and rosemary oil are easy to find and have been shown to be powerful cancer-fighters as well.