ok so im going over the book again and looking at what kind of things you can eat when out - in a restaurant or a treat for the kids etc and its saying you can have McDonalds?

Everything at a fast food place is going to be cooked in vegetable oil, if it's fried.  The only diet drink will be Coke ( or water ) and my kids were never allowed Coke, Hannah until she was about 10, and Calvin still not b/c it messes him up ( he can't eat chocolate, either, without going feral ).  The bread is clearly going to have sugar in it.  For all that, if you want your kids to follow you on to this diet, they need to not feel like they are in prison.  I think there's a section in the book where David says, if the kids end up at a party and eat sugar, it won't kill them, and tomorrow is another day.  That's how I've always approached fast food - it's not really food, but the kids like it, and if they get it once in a while, it won't kill them, and it makes them feel they get a say, and to have their way from time to time.