Personally, I think DAFNE is the key – with that knowledge, you can handle any food you want. I find the Bernstein “all carbs are evil” approach a little too extreme for my liking. I do like carbs, and with DAFNE I can eat them and get perfectly good control.
That said, if I want to get really tight control, or if I’m having issues and want to try and settle things down a bit, I find it easier if I eat fewer carbs. By fewer I mean probably less than about 90g a day, nothing like the small amounts Bernstein advocates.