When I was a child, it was all about the Hzunda (not sure of spelling, can't find it online) and yogurt.
I think how a person's genetics reacts to their environment is the real key to health.
As a child, I grew up in a farm tradition where the goal was "meat at every meal." Or it wasn't a meal. And for generations these people had brought over their ancestral farming, herding, and eating patterns.
Until puberty, that's how I ate, and I was healthy and energetic. Now, I do a version that works for a body that needs maintenance, not growth, which eliminates the carbs. I still eat my favorites, actually!
I knew lots of people, including family, who lived into their nineties. But if you moved them to somewhere else, with different foods and patterns: they would not.
Famously, "retiring to Florida," became something of a death sentence. I think it was because they didn't handle the sun the best way, ate out a lot more, snacked a lot more, got bored a lot more.
That cut into their potential span.