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 the…
Japan wearing face mask 24/7 since the 90s I believe (I wonder if it was all started after the diesel scandal)
(This is my understanding after living there for one year and then travelling for a month every other year for ~20 years. I’m not native though so there may be some nuance to mask wearing I’m missing)