Granted, you may have missed that fact since the ingredient is listed in fine print at the bottom of McDonald's website in this sentence: "Our fried menu items are cooked in a vegetable oil blend with citric acid added as a processing aid and dimethylpolysiloxane to reduce oil splatter when cooking."
As the Inc. report points out, this chemical is "a kind of silicone that is the main ingredient in the popular children's toy, Silly Putty. Oh, and caulks, adhesives, aquarium sealant, breast implants, and cosmetics." It's understandable that McDonald's hasn't been trumpeting its presence from atop the Golden Arches.
But it might be a miracle drug, so good thing we've been eating the Silly Putty chemical.