[That gets him to pause for the briefest of moments; it isn't much, but it's likely telling.]

Siebold-san has already been trying to get me to eat; he understands me entirely, so he's taken that to the logical conclusion of trying to cook for me.

I was able to give him a reason why I can't allow that, as well as a reason why I may have to avoid people sometime in the near future, but that won't last forever.