THere are no no-no foods - the rule of thumb is when all things are equal, if you can pick an option with lower nutrients, then pick that option. But that doesn't mean you can't have more nutritious foods when you want them, provided that you were within limits overall.
This diet is a bit of a work in progress and when I was first starting off, people were SOO hung up on the magic foods idea that I almost had to make the diets more about the foods themselves than I would have liked to, simply because people wanted/expected it.