Not sure if he has acromegaly, gigantism, etc. Guy is massive. Accordign to Wikpedia, the IFBB listed him at 6'11 1/2, 387 lbs. while competing. Won the Mr. India super-heavyweight class.
In the DVD extra stuff on The Longest Yard, they talk about his diet. Guy would eat 100 hard boiled eggs a day while shooting the film.