Individual intelligence makes the final decision. That is an example of the power of human intelligence, acting at the individual or personal level. It is appropriate to remind readers of some important points here. Survival is amoral. The moral arguments for vegetarianism are irrelevant in an evolutionary context.
Individual intelligence implies individual choice.
You are not required to eat meat or animal foods. Moral dietary decisions an exercise in individual intelligence. Your morality, as an exercise of your intelligence, can override other considerations, if you so choose.