The journal Nature Medicine published a major study about a cohort of over 105,000 people followed for 30 years. This is that researchers found.
Correlation isn't causation. But that's still interesting.
Being an omnivore allows us to get calories from multiple sources, which allows us to live long enough to breed. That's an evolutionary advantage.
After the point of breeding and raising children, evolution taps out.
So something being an evolutionary trait does not mean those traits lead to longevity. But it guarantees we're good fuckers.