I don't know about that, but there does appear to be a tradeoff between nutrition and fertility. When you eat less, you're less fertile. When you're less fertile, you live longer. A lot of what appears to allow us to live longer is lower rates of cancer, but the data I've seen there isn't rock solid and it isn't something I've dug deeply into. I only mention it because it's certainly studied and a question worth pursuing, with very interesting papers available if you look.

Something I read recently was about eunuchs living something like 25% longer than intact counterparts. However, the data was limited (15 each of eunuchs and intact as I recall). There were very few confounding factors, however. Really interesting stuff.

or in Inuit people who i imagine don't get much fresh fruit except a few berries?

> cultures that fast?

Are there any culture that fast in a way that would matter here ? Most of fasting traditions are mostly performative. The average joe probably fasted more by default a few thousand years ago than most people do now