Until recently I have not been aware of the discovery of Göbekli Tepe. It certainly is irrelevant if you are trying to figure out the proportions of micronutrients in the diet, but it helps to see the Civilisation in perspective, along with its dietary component.
In short, Göbekli Tepe is the oldest temple, built ca 12,000 years ago by hunters-gatherers in what is now south-western Turkey. Clearly agriculture was not a prerequisite for religion, architecture and complex social structure.
Here is the story of Göbekli Tepe, and here an even more thought provoking interpretation.
Interesting, that in one of the Sumerian myths one of the gods was supposed to offer Adapa (Adam) "bread of death", which was later adopted in the Genesis as fruit from the tree of life.