Maybe America's inane rates of obesity will go down.
One of the annoying things about this, is how the 'science' of dietary health has actually been a big part of this problem. As others have noted, the food pyramid is a part of the problem, but it goes past that.
I forget which wave of 'this isn't healthy, you shouldn't eat it' it was, but some time in the 80's or 90's a big push was made to have less fat in your diet, and people generally replaced that with carbs instead. This was a terrible move, as carbs are one of the biggest sources of building fat in your body, while animal fat in your diet has a broad variety of nutritional properties,
and for most people is actually easier to process and burn off than loading up on carbs.
Basically, unless you work a job that is very physically demanding, or you're a fitness nut who runs or works out
every day, high-carb diets are a bad idea. There's nothing inherently
wrong with carbs, but like everything else, you need to eat the right amount for your lifestyle, and the *#%($%(*ing food pyramid popularized the idea that we should have high-carb diets,
just as first world nations were shifting over almost entirely to jobs that were only moderately physically demanding (where standing and moderate work with your hands was all of the exertion) or outright sedentary.
Yet another example of the cultural authority of 'science' causing a boatload of problems.