The wolves believe that they can't get fat because, logically, their body actually needs all the food they consume; however, they don't take into account their beer bellies from all the wolfsbane laced alcohol they drink, thinking that it would work the same way, and they all swell up with massive sloshing beer bellies and spend all day, every day, drunk out of their minds, stumbling and slurring and drooling. Thank goodness they've got good caretakers/enablers in Styles, Lydia, Theo and the other members of the pack that this logic doesn't affect, because otherwise, they wouldn't even remember their own names or remember how to continue bringing bottles to their mouths without their kind and loving help.
Something about most of the pack with beer bellies is SO good. Or my theory of - sure wolfsbane beer gets them drunk, but there has to be a point where having ENOUGH regular beer will also get them drunk, they just...need about 10x as much. Their theory holds at first. When they have as much to drink as the humans of the back? No effect. So it gives them the false confidence that they can't get drunk and as much as Theo tells them he's still not going near the stuff because of all the empty calories- they ignore him. They drink more. Possibly spurred on by Stiles who pushes Scott and Derek into drinking competitions, to watch their bellies swell to the size of beer kegs. He swears if he put his ear against their swollen tanks, he could hear the beer sloshing in their gut. Which is when they discover if they drink that much? They do get the pleasant buzz and drunk feeling from it! Scott's never gotten to experience that - he's making up for all the time lost in his high school and college days! To them? They're fine. Doesn't sound like they're slurring or belching or hiccupping. Wolf strength! They're still agile and have fast reflexes. To a human, maybe. To the others? They can clearly tell the wolves are stumbling around with the agility of a drunk human. Lydia, Stiles, and Theo have the unspoken agreement they aren't going to suggest to them that a harder alcohol would get them their faster. They want to see the extra calories pile on. The mountain of beer cans left after the wolves have had a night of drinking. From that amount of booze? It also means the wolves aren't immune to a hangover. Which is when Stiles and Theo helpfully suggest to just drink more! They can't get hungover if they never stop drinking... Stiles has tape measure wrapped around their middles, eager to see how much he can pour into them before they hit wider than they are tall.
