take a look at super size me, a documentary about a film director who ate nothing but mcdonald's for thirty days. the consequences, of course, were horrible.
unfortunately, the film has a seriously problematic premise. its website, at least, is trying to say that fat -- rather than that-which-often-accompanies-fat, which is to say an unhealthy lifestyle -- is itself harmful. much of the website is covered with statistics about how many people are overweight. there are pictures of the director and star at the "beginning," showing off his flat tummy and kissing his biceps. then there are pictures of him at the end. we can't see his internal organ damage, so, film being film, we are implicitly invited to believe the story that the really wrong part here is the guy's flabby new look.
which is simply untrue, of course. still...can't wait to see the movie.