Everyone else is writing about Michael Phelps, so I might as well join the parade. He's gotten lots of publicity for his 12,000 calorie diet, including this webmd piece (which is skeptical).
It doesn't seem to include the right proportions of fruits and vegetables, but it may include the secret behind Mr. Pollan's "In Defense of Food" blurbs on behalf of traditional diets. A traditional diet, whether the all-meat diet of the Inuit or the cattle-blood diet of some cattle herding tribes, is usually matched by a traditional way of work. Michael Phelps' diet, and that of other athletes, is coordinated with the work they do. You can eat a traditional diet if you do the traditional work. If not, not.