I'll probably never stop wondering. I mean even if we're just going with unhealthy substance abuse, why calories? I'm not a huge booster for addiction or anything. But if for some reason I had to choose one addictive substance that'd kill me it sure as shit wouldn't be calories. Whether going up with meth or down with opiates, at least it's really providing something. And something that can still let you experience the world to some extent. For a while.  But even aside from that, as you say, there's the whole everything else. Like they literally can't have great sex. I'd argue that they probably can't even have good sex. The best sex most of them can have with those damaged bodies is piss poor. Can't fuck, can't run or jump, filled with floods of mood depressants at all times. And they chose it!