I don't think I was suggesting that he should require his users to sign a waiver of liability or anything like that. All I said was that something involving food should take this type of thing a bit more seriously than something that doesn't involve food. I'd imagine that the cookbooks themselves contain some type of disclaimer of this sort to help protect the authors and publishers. His site is basically a publisher where some of the authors are probably anonymous.

And I don't know where your second paragraph came from. Why does considering these things mean I'm unable to sleep at night? At some point, you made the decision to include a terms of service for your site. All I did was try to point out a couple things he should consider for his TOS that wouldn't be relevant for most sites.