How do trillions of microbes in your gut help you?
Belly City Builders
How do trillions of microbes in your gut help you?
Right now, deep in your belly, there's a city. Not made of buildings or streets — made of trillions of tiny living things called microbes. They're so small you'd need a microscope to see even one. But together? They're doing some of the most important work in your whole body.
Most of these microbes are bacteria — single-celled creatures that have lived inside animals for millions of years. You were born with almost none. But from your first day, they moved in. From your mother's skin, from the air, from every person who held you. By now, you're carrying around two to three pounds of them. That's heavier than your brain.
