It is a really good book, and has helped me deal with some of the life issues that used to express themselves in over-eating.
Food is mentioned in the last chapter. Her "complete and unabridged" food rules are:
1) You must only eat what you really enjoy.
2) You must really enjoy everything you eat.
She has a caveat that this works unless "and this is a big unless" you are eating for reasons other than physical hunger. But all that other stuff is what the rest of her book is about.
I am going to use the Joy Diet eating rules for my S-days - and really, now I think about it, for my N-days too.

I don't think they'd have worked for me before No-S. But I think they crystallize what makes a "good S-day" for me.