The animal-eating branch of human evolution persisted and led to human brain size increase, unlike the plant-eating branch.

“the it is interesting to note that that within anthropology it's not really debated that it was the animal eating branch of human evolution that persisted that changes were happening that something about our environment obviously we came from primates that were eating more plants or a lot of plants and something about our human environment really selected for us to eat more meat and as i've hypothesized and many others have as well that the eating of meat and the special unique nutrients in meat drove the grain the gain in brain size and was the key factor there”

“interestingly there there appeared to have been more herbivorous or plant-leaning species of hominins like parenthropus boseai that went extinct so around the time of homo erectus homo habilis there there is evidence of uh from stabilized studies that there was a species that leaned more toward plants in terms of its in the sec from the perspective of its omnivorous uh you know physiology and that species went extinct”

“so the plant-based versus animal-based debate was over two million years ago because paranthropus went extinct we are not adapted to be plant-based as humans eating meat made us human”

“and they see that early homo more on the carnivorous side more animal-based paranthropus more plant-based i'll repeat it again paranthropus went extinct”