It says "A diner should not take so large a bite that he is completely unable to speak, if he were addressed." which seems very reasonable. I can speak while ha

It says "A diner should not take so large a bite that he is completely unable to speak, if he were addressed." which seems very reasonable. I can speak while having a normal sized bite in mouth, although it's of course less than ideal and not polite these days. But sometimes useful for shorter utterances.