The new power breakfast

If you get enough exercise, you can eat anything you want. According to the BBC, Olympic swimmer Michael Phelps consumes about 10,000 calories a day but maintains himself at only about 8% body fat.

The problem for us mortals is that "enough exercise" can add up to a pretty enormous commitment. Phelps spends five hours a day in the pool, and it's a safe bet that his workouts are a bit more demanding than your average recreational swim.