[lmm]

Given that a) our ancestors lived a very different lifestyle and b) we would like to live long past child-raising age, which is where evolutionary benefits to longevity would mostly end, a diet similar to our ancestors is by no means a safe option.

[azernik]

s/ancestors/parents. They seem to be living decently long lives, so I'll let someone else experiment with liquid meal replacements for a decade or two, thank you very much.

[lmm]

Decent, yes. On the other hand, if diet changes were able to increase life expectancy by say 10 years (which is what some people claim agriculture reduced it by) then I'd jump at that.