Your microbiota is a community of trillions of bacteria, viruses, fungi, and archaea that works as a secondary organ alongside you — here you meet its core concepts and find your own way through the book.
I. Foundations
Your microbiota acts on you through five mechanisms — gut barrier, short-chain fatty acids, the gut–brain axis, immune modulation, and drug metabolism — and understanding them is what makes the lifestyle levers make sense.