Japanese people may have gained longevity by balancing their diets
What's not mentioned in the OP:- INSANE peer pressure. If you're skinny as a twig in the US, you're probably considered normal in Japan. If you're actually an obese person (again, in the US standard), people here wouldn't even look at you straight. This kind of environment put a huge pressure for one to stay in shape.- INSANE obsession for health. I hear that Americans are obsessed with health, but oh boy, have they looked into Japan. Small clinics are everywhere and they're always filled with anxious patients because they have a benign stomach pain or something. Physical checkup is mandatory for most companies. I also read that the fear of COVID in Japan is the strongest in the world, despite a relatively low infection/death number here. People are always talking about their health, and so is the national media. If you watch the Japanese TV, you'll also feel sick, simply because there's so much fear! Maybe this is good for public health overall, but I bet there's a certain mental toll.