That would be interesting, but part of the complexity of this is that "healthy lifestyle" may be as much about fitting together with genetic factors as approach

That would be interesting, but part of the complexity of this is that "healthy lifestyle" may be as much about fitting together with genetic factors as approaching some universal ideal. I think it would be really interesting (albeit unrealistic) if there were a baby exchange among various populations with high longevity in general or low CVD in particular, and see if there's any significant pattern. Would people with Tsimane ancestry thrive in Okinawa? Would people with Ryukyuan ancestry get a heart attack at 40 living on Sardinia?