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Fecal microbiota transplants sound wrong until you see the data: they cure recurrent C. difficile infections with ~90% efficacy where antibiotics repeatedly fail. The treatment is gross; the science is solid.

Your gut has its own nervous system — 500 million neurons that have been in constant dialogue with your brain since before you were born. The gut-brain axis isn't a metaphor; it's a two-way highway.

The human microbiome isn't a stable ecosystem — it's a dynamic negotiation between hundreds of species and your immune system. What tips that balance toward health or disease is one of the most active areas in current biology.

For most of medicine's history, microbes were the enemy. Then researchers found trillions of them living inside healthy people — doing essential jobs. The microbiome revolution is rewriting what it means to be human.

The probiotic industry is worth $60 billion. The clinical evidence supporting most of it is surprisingly thin. Some strains work for specific conditions; most are expensive placebo. Here's how to tell the difference.

The gut microbiome is famous, but your skin hosts 1,000+ bacterial species, your mouth harbors 700, and your lungs — once thought sterile — have their own ecosystem. Each one plays a distinct role in health and disease.

Not all viruses are threats. Trillions of bacteriophages live inside you, preying on bacteria rather than your cells. The human virome is vast, largely unexplored, and might be doing you more good than harm.