As far as I know the U.S. Big Mac didn't even contain real meat for a long time but something that's called "boneless lean beef trimmings". Jamie Oliver called it "pink slime" and won a lawsuit against the meat distributor: http://abcnews.go.com/blogs/health/2012/02/01/mcdonalds-announces-end-to-pink-slime-in-burgers/

Astonishing that you can red meat even more unhealthy!