We’re all teeming with microbes. We’ve got guts full of them, and they’re crawling all over our skin. These tiny, ancient life forms have evolved with us. And over the last couple of decades, scientists have come to realize just how important they are to our health and well-being. They help extract nutrients from our food, influence the way our immune systems work, and even send signals to our brains that play a role in our mental health.
