It's no surprise that an athlete would eat more food than the average person. But this is burger related, so here you go.
For a typical meal at in-N-Out, two-time Cy Young Award-winning San Francisco Giant's pitcher Tim Lincecum eats three double-doubles (without lettuce and tomatoes), two orders of fries, and a chocolate-strawberry milkshake, for a total of about 3100 calories. He tells Jim Caple of ESPN.com:
For me it's always been harder to put on weight than to take it off. It can drop easily for me because my metabolism is through the roof. I sweat a whole s---load. Given that, I try to fight it by eating often and eating a lot when I can until I'm full. And even then, just trying to stuff it in.
Caple takes the opportunity to try out Lincecum's meal on video. He does a pretty good job, but this is something better left for the pros.