In recent years, we’ve heard a lot about the microbiome, but the deeper story behind it is rarely discussed. For most of human history, people lived in constant partnership with a vast and complex world of microbes. These organisms were not simply passengers in the body. They formed part of an ecological system that interacted with digestion, immunity, metabolism, and the wider biological environment in which humans evolved.

Modern life, however, has changed that relationship in ways that are only now becoming clear. Urban living, altered diets, widespread antibiotic use, and reduced contact with natural environments have all influenced the diversity of microbes that people carry today. Many researchers now believe that the microbial communities associated with modern populations may be very different from those that supported human physiology for much of our evolutionary history.

In this episode, we explore the idea of “the microbes we lost along the way.” We look at how microbial diversity may have shifted over the past century, why diversity within the microbiome matters, and how changes in lifestyle, environment, and diet may influence the microbial ecosystems that live within us.

This is not a conversation about eliminating microbes. Quite the opposite. It is about understanding the ecological relationship between humans and the microscopic world that has always been part of us.

If we begin to see the human body not as an isolated machine but as a living ecosystem, the discussion around nutrition, environment, and microbial balance takes on a very different perspective.

So in this episode, we step back and ask a simple question:
What happened to the microbial partners that once travelled with us through history, and what might that mean for how we think about health today?