I've been overweight my entire life, and honestly, I blame the Surgeon General in the 1980s for telling my mom that feeding me low fat foods (which end up being high carb foods) will make me skinny. Everyone believed this cargo cult "science" and it has had a devastating impact for hundreds of millions of people.
I'm asking this sincerely, but don't people from traditionally healthy Asian countries eat a hell of a lot of rice? That's my first thought every time someone mentions how bad carbs are. But I have trouble finding any non-antecdotal data. I want to believe the obesity problem is more of a portion control thing, for example, when McDonald's opened, did a normal adult actually eat a hamburger and small fries for lunch…
For example: http://itc.conversationsnetwork.org/shows/detail4528.html