Quote Originally Posted by Spuuky View Post
The logical evidence that man turned teosinte into a nutritive plant is simply the fact that a plant in nature has no reason to be nutritive. What's wrong with that logic?
Other than the vast array of nutritive plants in nature?
That's the point. There isn't a vast array of nutritive plants in nature. We cultivated them. Most plants as they appeared before cultivation were only very minimally nutritive. Some things we eat today were cultivated from plants that provided less energy than the energy it took to consume them.

Because of this, human beings like any other animal had to spend almost all of their waking existence finding food. The advent of cultivation is the advent of civilization. It wasn't until we were able to create highly nutritive foods and produce them at a satisfactory scale that we were able to devote time to other pursuits.