To compare what animals eat to what Humans eat will always result in conflict and misunderstanding and can only serve the ego's need for opinions and validation. What Humans have in common with animals are a physical, etheric, and astral bodies. What distinguishes Humans from animals is the existence of an Ego/I-organization - animals are instinctual and react out of instinct and not by free will. Humans can act from free will and always by conscious choice. Plants on the other hand have a physical and etheric body. Nutrition is a dynamic process in the Human where it takes what is "non-Human" and transforms it into what is "Human" - in other words it takes substance and destroys whatever part of it that it was and creates new subtle forces that only Humans have (ie. Ego/I-organization).
When Humans eat plants they have to destroy the plant's physical and etheric structures and then create astral and Ego/I forces from it. To requires much more inner work for the Human organism and thus explains why in certain religions and spiritual traditions that advocate fasting from animal flesh to be come somewhat more Enlightened. When humans eat meat, the animal has already done most of the work of destroying and transforming the physical and etheric structures and in this sense can make an individual "spiritually lazy" in developing their own "spiritual" forces. Also, by eating meat, one has to deal with and take in all of the animal's astralities (ie. feelings, emotions, etc) and if the person is not grounded enough, they will experience the animal's fears, aggression, horniness, etc.
Eating exclusively a plant diet can help one develop more inner/esoteric spiritual capacities but the major warning here is that if the person has ANY unresolved emotional/mental/spiritual
The debate between animal flesh and veganism is a distraction from the ego experiencing what Is. It attaches to reference points to validate its existence and to be conscious of experience. Dualism always creates separation with one side contrasting with the other. On the microscopic level, quantum science demonstrates the separation is a necessary illusion and the actuality is an interconnected matrix/field where both sides of the fence are in reality the same fence and debating between meat vs. no meat is like your left hand arguing with your right hand about which is better....totality ridiculous but enlightening at the same time.