Byamba Ulambayar is one of the most dominant Sumo wrestlers in the world. A former professional Sumo, Byamba is an ambassador for the sport and art of Sumo and here is a great video on Byamba's diet. Comprised of a specific stew called chankonabe, wrestlers purposefully pack on the weight in an effort to become heavier and harder to move.
Byamba is a world class champ with a great sense of humor. Hope to bring him to Seattle some day for a seminar.