disturbing to see one talking with food in his/her mouth. it's impolite plus it could get messy too. when one talks while chewing, there's a tendency that the chewed food might accidentally get out of the mouth which may cause spreading of virus should he have colds or cough. finish chewing before talking. it's not a pleasant sight to see the food you are chewing right?
chew quietly. table manners say in most countries say, we should make no noise when chewing. better when mouth is closed when chewing too.
get only what you can finish. when dining in or out and there's food on the table, they should just get serving 