"All McDonald's nuggets are not created equal.
U.S. McNuggets not only contain more calories and fat than their British counterparts, but also chemicals not found across the Atlantic.
CNN investigated the differences after receiving a blog comment asking about them.
American McNuggets (190 calories, 12 grams of fat, 2 grams of saturated fat for 4 pieces) contain the chemical preservative tBHQ, tertiary butylhydroquinone, a petroleum-based product. They also contain dimethylpolysiloxane, "an anti-foaming agent" also used in Silly Putty.
By contrast, British McNuggets (170 calories, 9 grams of fat, 1 gram of saturated fat for 4 pieces) lists neither chemical among its ingredients."
Not that I've had a McNugget since I was 10 or so, but still - yikes!