Researchers have analyzed fossilized teeth of Australopithecus africanus, an early human relative, and found that bipedal primates likely followed a vegetarian diet rich in salad-like plants. The study suggests these early humans spent more time eating greens than meat, with the majority of their food consisting of fruits, nuts, and seeds.
Source: https://www.sciencenews.org/article/early-human-ancestors-didnt-eat-meat