Here’s something interesting that you should be aware of: Nate Quarry was a sick motherfucker when he fought Demian Maia back at UFC 91. From an interview with MMA Fanhouse:
I was at UFC 91 when you lost to Maia, and I heard rumblings that you were very sick and weak but you still went through with the fight? How sick were you?
I definitely don’t want to use that as an excuse because he was by far the better fighter that day. His jiu-jitsu was phenomenal. It was an honor to fight him. I ended up getting a bad stomatch flu virus after cutting weight. I threw up from about 6 pm to 11 pm after the weigh-ins and had a fever of around 102. From the time I made weight to the time I left to go to the venue the next day, I didn’t leave my bed at all except to throw up and take a shower. But that’s just the way it is. I wasn’t about to call Maia and say, ‘Hey, I’m not feeling good. Sorry you can’t feed your family.’ I had so many friends and family there. I went out and did the best I possibly could on that given day with what I had. I still went in to finish the fight and he was able to beat me. He’s a phenomenal fighter. If we were to fight again, who knows, maybe the exact same thing would happen and he’d catch me in a choke again. I did the best I could and I have no regrets.
There are excuses and then there are explanations, and I think it’s pretty clear that this is the latter. I know that getting sick right before a fight happens more than you’d think, but it always amazes me that lots of these guys go out anyways even though they might be shitting and puking in a bucket right up until they’re called out.