n 2011, Novak Djokovic had what has been called the greatest single season ever by a professional tennis player. He won ten titles, three Grand Slams and 43 consecutive matches. Remarkably, less than two years earlier, this champion could barely complete a tournament. How did a player once plagued by aches, breathing difficulties and injuries on court suddenly become the number-one tennis player in the world? The answer is astonishing: he changed what he ate.