Why are there so many FAT fighters in MMA?

too many overweight fighters in mma, causes them to be slow, out of shape, no condition, unlike professional boxers that have to be capable of jogging at least 11 miles or so. You have guys like Chuck Liddell, anyone ever seen his stomach? Now you got this guy they call Roy Nelson on Ultimate Fighter, Roy Nelson... lol, who the hell is this guy? He has no boxing skills whatsoever, there is nothing to him, he looks like he is pregnant with twins and like he just finished eating a pack of twinkies plus a couple of beers after that. here is a picture of him http://ets.sbnation.com/imported_ets/25990/610x.jpg it's not so hard to get into mma, just eat a couple of cakes every day for like 2 months, another one is Tim Sylvia... disgusting