I am taking a wag at this.
Partially hydrogenated vegetable oil. Free radicals/carcinogen stuff.
I don't buy anything with that in it just to be on the safe side. I cook with butter and olive oil and don't bother giving my kids shortening stuff. I buy their crackers in the natural food aisle. They took the transfats out of Pepperidge Farm goldfish.
I know Five Brothers fries their fries in peanut oil.
But to follow up, I'm a little freaked out by those apples they serve with the McDonald's Happy Meals. We left them in the car once for about a week and they were still white and crunchy.
So now I get the fries.
We just go there rarely anymore.