Why are people so Healthy in Japan?

Having lived in America and now living in Japan, it’s interesting to see how very different these two food environments are.
I’ve seen comments on another one of my videos about low carb saying something like “Oh sure, you can lose weight on low carb, which is why all the rice eating Japanese people are so thin, right?”
So with this video (and maybe the last one), I’m hoping to show that the diet over here is more complex than just “high carb”.