They think it's not very elegant to open their mouths wide :D Posers.
I'm not even sure they could get fat, just because of their personalities.... And because they don't sit down very much.
They probably wear night gowns that don't look very different to their priest robes... and maybe they even wear those pointy sleeping hats
Squire David may get a meal before the end of the comic! Haha... He's based on a friend of mine as well, and on his request there might even be an evil sidekick Squire David twin with a moustache.
I like him ^_^ (he's hard to draw though)