“You ever notice they don’t call them “milkshakes” anymore? Someone once told me they had to stop that long ago, when they stopped making them like real milkshakes and started mass-producing them from chemicals. I guess calling them simply "shakes" sounded better than "chemshakes." That may just be an urban myth, but it's still a great story.” (p. 132)Sneaky, isn't it? Spurlock words the passage so that he can plant the seed that McDonalds shakes are synthetic chemical goo without actually asserting so. He knows if he'd done the latter, he'd be baldly and provably wrong (though that doesn't seem to stop him elsewhere in the book). The "someone told me" crutch lets him publish a disparaging urban legend without taking any responsibility for its accuracy.
Yes, Spurlock, it is an urban legend. A quick Google search would have revealed as much. The primary ingredient in a McDonalds shake is "whole milk." The milk is powdered to make it longer lasting and easier to store. McDonalds stopped calling them "milkshakes" because it didn't want to mislead people into thinking the shakes were the old-fashioned variety made with ice cream. It's an act of corporate resonpsibility (truth in advertising) that one would think people like Spurlock would applaud. The method McDonalds uses for its shakes makes them cheaper and easier to prepare for busy customers than hand-dipping.
FYI, wanna' know the primary ingredient in McDonalds apple pie filling?