The condition of our microbiome?the billions of bacteria that inhabit our digestive tract?and our likelihood of contracting deadly viral diseases like COVID-19 are now strongly correlated, according to numerous studies. Our microbiome has been disrupted by low-fiber diets, little exposure to nature, and overzealous pharmaceutical use, making many of us more vulnerable to viruses than we should be. The good news is that, in contrast to our genes, our microbiome is continually changing, providing a route back to health for those who are ill and evidence-based defence for those who wish to remain healthy. Dr. Robynne Chutkan describes this ground-breaking study in The Anti-Viral Gut and provides a step-by-step guide for anyone attempting to prevent or recover from a viral disease.