When one of the UFC's most recognizable, controversial and fiery fighters, Nate Diaz, steps into the Octagon Saturday night to fight Benson Henderson for Henderson's lightweight belt on UFC on FOX, he'll conjure plenty of images in fans' minds.
First is his thick-as-thieves relationship with his older brother, Nick, a UFC welterweight contender who'll soon come off a yearlong suspension for testing positive for marijuana metabolites. Then there's the Stockton, Calif., brothers' thuggish reputation that follows them wherever they go, fairly or not. Then there's Diaz's penchant to throw double middle fingers at the camera after -- or even during -- his fights.
The surface image that Nate Diaz conjures is neither a positive nor a wholesome one.
But what the casual UFC fans may not know about Diaz and his brother may be the one thing that defines them most outside the Octagon: Their manic attention to fitness and nutrition.
Where most UFC fighters train with an obsessive focus on th...