I saw this movie a couple months ago already. My sister's high school friend is the producer, and so she drug me to the "premier", with subsequent QA with the filmmakers and many people in it afterward.
It's an alright movie, but it devolves into political commentary too often. I shit you not, there is about a 15 minute stretch in the middle that is nothing but a collage of clips of President Bush jumbling words trying to talk about health or nutrition, with editing and music clearly trying to put heaps of blame on Bush or Republicans (And the film actually opens with interviews with Bill Clinton talking about how he's struggled with eating junk all his life, presented in a sympathetic almost glorifying way) It just rubbed me the wrong way, and it diluted it's message.
There are a couple of good stories presented in it though. The one that sticks in my mind is they go into a lot of depth concerning the corn industry. They show how corn is literally in absolutely everything we buy now, edible or not - and show how the corn farmer lobby has had a huge grip on Washington for eons. It then diagrams the actual nutritional value of corn and corn based products.
Overall I'd give the movie a C. The filmmakers spent way too much time essentially trying to prove why it's important that the government has far more control in advertising, food regulation, school lunches, etc. They basically want the government to babysit our diets as if we are not capable of responsibility ourselves. In doing so, they get super partisan to the point that it feels like George Sorross paid for it.
My sister said about a year ago she saw a 3 1/2 hour cut of the movie that had a lot more interesting stuff they cut out, she told them it was also way too politically charged, but unfortunately they cut the interesting stuff and left in the politics. the current cut is about 90 minutes.
If you must see this, wait for rental.