my new headcanon is that rudy gets diagnosed with celiac disease when he's 12 or 13 (one of his many many health issues and allergies) and when he tells louise that he's sad he cant eat at bob's burgers anymore bcuz the buns have gluten in them bob makes a special order for gluten free buns and stores them seperately so that rudy can always enjoy his burgers :) <- and anyone else who is gluten intolerant there's like a special sign that says "ask about our gluten free options!!"