I really don't know why people are doubting GSP when he says he has colitis. I mean, GSP was complaining about vomiting before the fight, before he even brought up colitis. If this was some excuse he'd conjured, I would have expected him to say he'd been suffering from colitis in the post fight interviews, which he didn't.
I believe that GSP gave 185 an honest effort, and had he felt good and his heavier build agreed with him, he would have definitely fought Robert Whitaker. But he didn't look good with the extra weight and he has health problems.
Colitis is a serious disease. Why are we automatically assuming GSP doesn't have colitis? Does anyone have any evidence? I'm sure the UFC are getting their doctors to look at GSP -- if Dana White could prove GSP was lying about having colitis, he would. Trust me, DFW hates GSP for some reason.