How is it a solved problem? Did Japan have some sort of campaign that shifted their entire culture from a fat one to a skinny one that we can replicate? If not

How is it a solved problem? Did Japan have some sort of campaign that shifted their entire culture from a fat one to a skinny one that we can replicate? If not, are you suggesting you know how to do that? The problem isn't knowing what an individual needs to do. It's knowing how to get an entire country from where we are currently to that point desired point.