Never mind the movie. Check out the book "Fast Food Nation" by Eric Schlosser (they guy in the special features part of the SSM DVD that's interviewed by Morgan).
That book will, if not make you swear off processed meat, at least keep you within 100 yards of a fast food joint for the rest of your natural born life-life-life..life......life...(insert echo here).
Funny, despite all the claims (backed by research and meticulous notes) NO ONE TO DATE has filed a lawsuit for slander, liable, whatever against Mr. Schlosser. Percieved reason - his stuff IS accurate and his conclusions logical and therefore would come out in court as a matter of public record. Keep in mind that McDonalds sues at the drop of a hat.
One of the most informed and best backed books on the nation's nutrition I've ever read. Hell even ol Morgan clearly defers to Mr. Schlosser in the interview.