You're still wrong. The types and ratios of fat found in beef are not the same as in a chicken or a peanut. The type of carbs in a whole grain bread are not the same as in a box of cereal. The protein in fish is not the same as the protein in a banana. The same goes for vitamins, minerals, phenols/flavonoids, etc.
The study John's Ultimatum quoted is correct. The problem is almost entirely diet. Americans are getting fatter even though they're more than ever concerned about health and exercising more than they ever have in the past. People have been sendentary watching TV or listening to radio, using cars to get anywhere, and sitting in offices all day long before this obesity epidemic started around the '70s.
The country is fat because of a huge amount of cheap, low-quality food, all made possible by subsidized corn and soy. This isn't just fast food and soda either. Nearly all of the supermarket-bought beef, chicken, and fish some of you brag about using for healthier meals is corn-fed and as a result, fattier, less nutritious than in the past (proven by studies), and abundant (bigger portions). The food we eat today is worse than identical food our grandparents ate. It pretty much explains the many, though not all, who try to eat "normal" and still can't maintain a good weight. Saying you don't want the gov't deciding what you eat is stupid. It was decided before you were born by lobbyists from the food industry.
A soda tax makes sense but the real solution is to get rid of subsidies (which we pay for with taxes). It's one of several hidden costs that makes much of the food we all buy more expensive than the listed price. And please, let's stop saying this is only about the obese or working poor. Americans at all levels of income and education are less healthy than in the past and certainly less healthy than current-day counterparts in other countries.
http://www.nytimes.com/2009/09/10/opinion/10pollan.html
The author of this article also wrote the Omnivore's Dilemma which I recommend some of you read. It goes beyond Fast Food Nation in explaining why nearly everyone, not just the fast food consumer, is less healthy today.