To get a sense of what a fully functional microbiota might look like, we can look to the last remaining full-time hunter-gatherers in Africa, the Hadza. They live in the cradle of human evolution, the Great Rift Valley of Tanzania, home to some of the most ancient remains of our human ancestors dating back millions of years. Their diet and microbiota provides the closest modern-day approximation to that of our ancestors who lived before the advent of agriculture.
