Obviously it didn't work since Americans became fatter and still holds to the first place in being the heaviest people on earth. So now, the government is being a bit more blunt about it: Just eat less.
Woho. Someone had to do it. I remember when I went to Los Angeles a few years ago and ordered a small caesar salad. When the plate came in I was shocked by the sheer quantity of food, it was like I had a small farm with dead chickens on a plate in front of me - needless to say, the doggy bag lasted me for a while.
The portions sizes I saw in America were more like sizes of furniture than normal plate sizes. I think the whole country along the line of progression forgot that our stomachs are the size of a fist. So it gets quite tricky when you try to press down a meal the size of a horse into it. Just a thought.