I understand your point about the animals not eating that food, but humans became agricultural and started eating those foods.
Maybe I am splitting hairs with you but I would refer to that food as not being part of the "traditional" diet, not using the term "natural".
Traditional diets vary by the geography of the people, such as it might be traditional for someone from central america to eat bananas, while in Canada it would not be. The only consistent traditional food of primitive man that I know of is meat, greens, berries, nuts. I am probably excluding one or two things of course.
I would also have to contemplate the assumption that because something was a traditional diet, does that for sure make it the best diet? How does that relate to the fact that we live longer now? A complex question for sure. A traditional diet was limited by what was available as well.
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