Cayenne Pepper

Get spicy! According to recent research published in the journal Physiology & Behavior, just half a teaspoon of cayenne pepper can boost metabolism and cause the body to burn an extra 10 calories on its own. Not to mention that for those who don't regularly eat spicy meals, adding cayenne pepper cuts an average of 60 calories from their next meal. Do that at two meals a day for a month and you'll lose 4 pounds without even trying!source by http://www.shape.com