Remember the Woody Allen movie "Sleeper"? In my favorite scene, set over 200 years from now, a physician can't believe how people dieted in earlier times. "You mean there was no deep fat? No steak or cream pies or hot fudge?" he asks. His colleague answers, "Those were thought to be unhealthy ... precisely the opposite of what we now know to be true." Allen was just trying to be funny, but he may have been more prescient than he realized. Today we know that chocolate can be good for you, we've