Within two and a half hours...you can resist a pizza buffet.
Even if Mario Batali invites you to dinner tonight, you might be surprised by your own restraint. About 2.5 hours after eating 70-percent-cocoa chocolate (a 3.5-ounce bar), volunteers at the University of Copenhagen consumed 17 percent fewer calories at an all-you-can-eat pizza buffet than if they had eaten milk chocolate earlier on. Sweet, salty or fatty foods just didn't have the same draw, they said. Other research confirms: Dark chocolate—perhaps because it's so intense—decreases levels of the appetite-stimulating hormone ghrelin and is more filling. And here's the surprise: Even the smell of it made people less hungry.