Welcome to the CEO Diet, a new monthly series in  Bloomberg Businessweek , where executives from around the world tell us how they manage their time away from the office. 
“No one eats more burgers than I do,” maintains John Eckbert, the London-based CEO of the Five Guys chain which has over 1,900 locations worldwide. He works out regularly to balance his diet.
He is, he says, “a bit ...

