I like the film in that it shows just how bad "Supersizing" makes things. However, it kind of irks me when people watch it and think that it's eating McDonald's in and of itself that causes that kind of deterioration in health, and yet they'll down a liter of soda and a jumbo bag of chips while vegging out.
Fast food is certainly not clean eating most of the time, but it's okay in moderation. Hell, I love fast food! It's exactly that -- fast! And it can be very cheap! And I don't have to cook and clean at all! I just watch the portions and frequency (Well I'm not eating it at all right now since I'm cutting, w/the exception of Popeye's chicken, skin removed... mmm...).
I think skipping out on the fries and soda alone helps tremendously. Look at the dude in that movie who eats one Big Mac everday. His cholesterol is under 200 and he's a stick!