The glue in sausage meat is another big one I read about.
in some packaged sausages they don't use fresh meat, so it doesn't stick properly to make the sausage. (They use the left overs from the animal)
So they use a glue, to stick the meat into a sausage shape :P
I'm a peskatarian so I've never been to Mc Donald's, but damn, the stuff I've read about them is disgusting.
My Granddad who's from the Canary islands was very poor as a child, they had barley anything food wise, but you can guarantee he had a better diet than the average person today.
He lived primarily off goffeo, fruit and vegetables, and he's only ever been I'll about twice, he's in his 70's :P
Processed food is just too readily available.