After watching the documentary "Supersize Me" the kids refused to frequent McDonalds any longer (which was just fine with Husband and I). We were very impressed that our kids, ages 8 and 10 at the time, were able to recognize that lack of nutritional value in fast food meals and could made this decision on their own.
The other day a commercial for McDonalds appear on TV and it featured a Big Mac. I said to Husband "We haven't eaten at a McDonalds for 5 years and yet I can still vividly recall the taste and texture of a Big Mac". His comments was "Yeah... I wonder what they put in there to not only make you remember it, but also to want it."
We no longer frequent any fast food places that serve hamburgers and french fries. A decision we made as a family and we have all kept to it. I have tried to tempt the kids into it a couple of times to see what they say, and it is usually "Oh yuck! Can we get a pita instead?".
Daughter has made the confession that she went through the McDonalds drivethru with a friend's family... "but I only had a yogurt, honest!"