For some stories, I'd say it could be a normal human being because all they do is specify that they ate "a lot" of food.  Like the House of Prime Rib guy and his wife.  We don't know how much they ate, just that they couldn't even walk up a hill afterwards.  How much that is is unknown.  It might have been enough to feed a pride of lions, or it might be a typical fatty appetizer. But the dude who ate a whole fucking ham, or the bitch who ate a cake, or the fatty who faked going to the gym for fucking MCDONALDS...that last one offends me so much.  Not only is he lying to his wife, he didn't even get good food.