Oh no no no! I didn't mean to say that fat Americans are the result solely of food manipulation!

My point for that post was that due to food altering, there is a cause and effect result. Little Dragon pointed this out very well.
Of course there is personal responsibility involved. Fat Americans are the result of fast food (which is misrepresented food as you saw in Supersize Me), stressful lifestyle, inactive lifestyle, increased technology (riding lawnmowers instead of the old manual push mowers, for example), lack of nutritional savvy, processed instant foods, and a host of advertising that says "buy me!". Even the grocery stores are set up for you to buy the processed foods over the natural foods because advertising. High calorie items are placed in the front and center of the store. You have to travel through those foods to get to the vegetables, fresh meat, and dairy, etc. (I noticed at Deen in Holland it is like that too). Going through the drive through at McDonalds (easy, you don't even have to get out of your car to get your food) you will be asked "Do you want to supersize this?" Always I tell them no, only to find that when I drive away, many times it has been supersized anyway!
But in all of these situations, there is the matter of personal responsibility. I can choose not to eat ALL the fries (which are also dipped in sugar...you don't taste it, but it makes a crisper fry and you get the calories from the sugar), I can choose not to go to Micky D's to begin with. I can choose to get off the couch and be active. (When I was in Holland I could eat anything I wanted and was losing weight. Why? I didn't have a car and I either rode my bike or walked to get to where I wanted)
Fat Americans are the result of so many things. Some can be controlled, others cannot.