Oh! Sorry for the gender confusion, I didn't know! Didn't think to check your profile...
Anyway, as for the documentary itself, I always figured it was either for publicity or simply a weak public statement that is already common knowledge: Fast food isn't healthy, you shouldn't base a diet completely off of it! Or at least, you shouldn't, then complain about it (Yes, I do happen to make a diet completely off of it, but my saying is 'Better dead young and happy, with a full stomach of damn good stuff, than dead old and unsatisfied with a half-empty stomach filled with utterly tasteless crap.').
As for the prospect being unappetizing to you, thats perfectly understandable. Everyone has different tastes, and hell, some tastes you just acquire over time. Thats one of the best things about the world is having a very wide array of different foods.
And when it comes to fat people blaming companies such as McDonalds for their obesity, even though THEY were the ones who CHOSE to eat there, it just seems ass-backwards. A (very) loose metaphor: You happen to be the owner of a handgun. You rarely ever use it, and only at a firing range. You decide to clean it at home, but forget to put on the safety and unload it. Inevitably, due to sheer stupidity, you end up shooting yourself, say, in the leg. And then, you exclaim, "OW! I'M GOING TO SUE SMITH AND WESSON!" (Feel free to substitute a better firearm manufacturer if you wish, and please, don't feel that this is directed at you! This is simply a (again, very) loose metaphor. Not meant to be offensive, simply informative.)
Since I've already made a wall of text, I might as well apologize again for the gender confusion! I'm very sorry!