In my writing I often rely on our distant past of humans to determine what we should eat and how we should behave. The adaptations come extremly slowly, and rapid changes are usually not healthy, if you don't believe then feed your cats cooked cabadge and you will see how long it will live.
There are exceptions however, species that are normally carnivorous develop sub-species that eat vegetables. The example would be a panda bear, or certain apes.
Humans have had the sidekick species that ate vegetables too. Paranthropus boisei who lived 2.3 million years ago in Africa had jaws that were massive by today's standards. The muscles around the face were buldging as in these days the fire was not known for these primitve ancestors or ours. We cannot say for sure how different was their digestive system, the stomach might have been bigger than ours as vegetables have very little nuritional value and take long to digest. Otherwise, we have to assume the they still had the basic ominvore digestive system and did not pass the termite hill, or a bird nest when they found one. They were not vegeterian as we think of it.
There are exceptions however, species that are normally carnivorous develop sub-species that eat vegetables. The example would be a panda bear, or certain apes.
Humans have had the sidekick species that ate vegetables too. Paranthropus boisei who lived 2.3 million years ago in Africa had jaws that were massive by today's standards. The muscles around the face were buldging as in these days the fire was not known for these primitve ancestors or ours. We cannot say for sure how different was their digestive system, the stomach might have been bigger than ours as vegetables have very little nuritional value and take long to digest. Otherwise, we have to assume the they still had the basic ominvore digestive system and did not pass the termite hill, or a bird nest when they found one. They were not vegeterian as we think of it.
