> Humans evolved consuming only organic material from their very beginnings up until about 100 years ago.
Humans also evolved to have a dozen or so children and see four or five of them make it to adulthood.
The reason you see life expectancies as low as 35 for past European cultures isn't that the people were dying in early middle age: Adults could and did live to see 70 or more. It was because they had horrible infant mortality rates combined with horrible death tolls from childhood illnesses.
The only thing keeping everyone from going back to that is chemicals. The modern First World have-three-kids-keep-three-kids lifestyle is entirely artificial. It depends on artificial things to keep it going.
Humans also evolved to have a dozen or so children and see four or five of them make it to adulthood.
The reason you see life expectancies as low as 35 for past European cultures isn't that the people were dying in early middle age: Adults could and did live to see 70 or more. It was because they had horrible infant mortality rates combined with horrible death tolls from childhood illnesses.
The only thing keeping everyone from going back to that is chemicals. The modern First World have-three-kids-keep-three-kids lifestyle is entirely artificial. It depends on artificial things to keep it going.