Alcoholics With Eating Disorders

So people with Bulimia tend to be skinny. That's the one where you eat but puke it all back up. Oddly I know lots of alcoholics and many of them are rather fat, but they do the same thing. I've seen people consume what appear to be whole cows and after enough alcohol it all comes back up. Yet these are some of the biggest people I know. Then you have someone bulimic who does the same thing and they look Ethiopian. There's something there that the bulimics know that the alcoholics don't. Or they're just cheating.