>Again, though, when discussing evolution we're talking about human-design-space, not specifics about individual human cultures. Yes, in principle, and that is

>Again, though, when discussing evolution we're talking about human-design-space, not specifics about individual human cultures. Yes, in principle, and that is definitely a good point. But with hindsight we can observe that the part of the "design space" that includes 90 year olds was never before explored, and hence evolution tells us nothing about whether or not hunter-gatherer diets are good for longevity.