Up to. Ancient diets are extremely environment dependent and variable. One week a tribe could be 100% nuts and berries, only for next week to be 100% meat, beca

Up to. Ancient diets are extremely environment dependent and variable. One week a tribe could be 100% nuts and berries, only for next week to be 100% meat, because tribe stumbled upon migratory herd of animals. It's plausible some tribes didn't eat humans, while others ate humans after wars or on predefined occasion. Like e.g. when important person dies, or moon is full, or there isn't anything else to eat.