After a year...you may feel thinner.
Chocolate poses an intriguing paradox, found researchers at the University of California at San Diego. Of the 1,000 adults they followed, those who regularly ate the stuff more than twice a week turned out to be slightly thinner than those who ate it less frequently. And, no, they weren't exercising more. The mystery may be explained by rodent studies in which cocoa's flavanols subtly retuned metabolism and increased sensitivity to insulin—resulting in the seemingly impossible: exercise-free, diet-free weight loss. But before you go hog-wild, note that the chocolate lovers didn't necessarily eat chocolate every day or very much in a serving. It's an energy-dense food, says Haskell-Ramsay—especially when sugar is added. To prevent your habit from leading to weight gain, she recommends making sure that the chocolate is consumed in place of—rather than in addition to—something else.