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We're continuing our adventures in east Africa with the Hadza – a skilled tribe of hunter gatherers who could be the last remaining link to our ancient food past. We join them as they hunt and forage, eating baobab for breakfast and enjoying some very unusual honey, all in the quest to discover the ideal human diet.

The reason the scientists and geneticists are so interested in the Hadza, is because it’s thought they can help us better understand our complex relationship with our gut microbiome – the community of microbes that live inside us all. It’s thought the microbiome exerts such a powerful influence on our health it’s considered now to be in an organ in its own right, and the Hadza have a diversity of gut microbes unmatched by any group on earth. So if the Hadza can help us understand the microbiome and where our modern diets have gone wrong in depleting gut microbe diversity, perhaps the secrets of the their diet can help us all become healthier humans.