I can understand your sentiment about killing our fellow creatures to eat. The killing of any living creatures carries some feeling of guilt for me even though I eat meat. I suppose one could be healthy on a meat-free diet assuming that the essential requirements can be sourced from elsewhere.
Most societies are tethered to diets that include meat so it would take a great deal to reverse this. We have been eating meat since and before the time that humans came down from the trees onto the African savannahs.
