A plant-driven diet style does NOT mean vegetarian. Eat plants, seeds, nuts, and some fruit. Eat quality protein. Eat healthy fats.
Picture a world without buildings, automobiles, cities, factories, gyms, schools, freeways, airports, shipyards, yes, even electronics. Try to visualize the different landscapes: the jungle, with its huge trees and intense animal noises, a vast savanna, with many types of prairie grasses growing and different big game animals roaming in huge packs, and the desert, with its own unique geography and animals, specifically adapted to its seemingly inhospitable climate. These are all places that throughout time humans have called home, and it was the selective pressures in these places that shaped our genome, our heredity, what makes humans humans.