The secret to banishing belly fat is, well, fat. But this is not your grandmother's artery-clogging saturated fat, the kind lurking in cheeseburgers, pizza, and pie. This class of healthy fat is known as monounsaturated fatty acids (MUFAs), and it is found in nuts, olives, avocados, and dark chocolate. Instead of hurting your health, MUFAs help improve circulation, strengthen your heart, and can reduce belly fat faster than if you were following a low-calorie diet that contained little to no fat, according to studies. "Monounsaturated fats help you stay satisfied and may help you eat less overall," says Tracy Gensler, MS, RD. Here's how to sneak these fat burners into any meal.