Long story short, as soon as he starts weight cutting, his body looses all imminity and he catches all pokemons viruses.
Weight cut is a huge stress for the body. I've done weight cuts, your testosterone levels drop a lot (mine doesn't drop much because I have higher than normal levels), your energy levels decrease, your body is weak, you feel dizzy and lightheaded. When I did a cut, every second I felt like I was about to pass out and it amazes me when Connor was doing extreme weight cuts and still had the motivation and energy to do crazy things during weigh ins.When american football teams travel on the road some hire strippers, groupies and prostitutes to entertain them in their hotel rooms.
European footballers do the same too, every rich athlete does that because that's cool, fun and everyone enjoys it 
I wonder why no one posted anything about UFC 318 event. Holloway VS Poirier was an amazing fight. Sadly, Dustin lost the fight and retired, wish he would retire after win but it is what it is, he will always stay as a legend in our heart. It was beautiful to watch his fights, I'll miss him, I wanted it so badly to see him versus Topuria but that's sadly not going to happen.