> our physiology requires us to eat them just as they must eat each other.

This not true as you pointed out yourself.

Not human physiology but a certain environment requires humans to eat meat because there is nothing better available.

In all societies except the most retarded, a vegan diet with supplements (notably vitamin B12) is the cheapest and healthiest diet.

https://www.eatright.org/food/nutrition/vegetarian-and-speci...