I hear it all the time: why not just eat a diet like the Okinawans, the healthiest and longest lived people in the world? Traditionally they ate rice, tofu, and almost no meat! Unfortunately after WWII Americans introduced bad foods like pork and now disease rates are increasing.
That's the conventional narrative at least. Honestly, I'm not sure about the Okinawan diet. Most of the people discussing it are Americans with some sort of ax to grind. I would love to hear some Okinawan voices tell us what they actually ate, but those are few and far between.