and they even talk the same way this hambeast does where it sounds like they have the literacy of a 10 year old  Check the sidebar, or drop down tab if you're on mobile, for links to The One True Book, and you can look a bunch of this shit up. Basically, once a thing gets that fat and riddled with adipose and all the ensuing fucked up hormone levels that come with it, side effects can be sterility, which would be awesome of they all got that, but more to what you asked, their brain gets totally fucked. Imagine a nice, ripe grape, pick a type, doesn't matter. That's a typical shitlord's brain. Now imagine a raisin, all those extra sugars and additional shit that wouldn't normally be there.. That's a butterbeast brain. Shriveled looking, lower mass, less surface area, looks like it's already entropic because it is. Fat to the point of these grease goblins like simply beetus literally, physiologically, scientifically, makes them stupid.