I've never heard of those first two things. But elves are faeries. [He frowns a little, looking unsure.] You're not supposed to eat or drink things when you're in Faerie or else you won't be able to leave. [Maybe this is a part of Faerie? He still isn't entirely sure.]

... Elves are also eight inches tall. They have sharp teeth too. They bite. [It might seem like he's rambling a bit, but stating facts is one of the things that sometimes helps to soothe him when he's stressed and upset.]

You don't look eight inches tall. Do you have sharp teeth?