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You're listening to Life KIT from npr.
Hey everybody, it's Marielle.
Have you ever seen the kids TV show the Magic School Bus?
I was a big fan.
The show's main character, the school teacher and fashion icon Ms.
Frizzle, would take her students on adventures in a magic school bus.
Sometimes they'd end up in the human body.
They'd pile into the bus, shrink down until they were very little,
drive up somebody's nose or down their gullet and observe the wilds of the human body up close and personal.
If we could all hop on that bus together and take a trip to the human gut, we would see trillions of microbes at work.
Here's NPR health correspondent Maria Godoy.
They break down food that our bodies can't digest.
And as a result of that breakdown process, they produce chemical messengers that influence our health.
And we're talking everything from, you know, blood sugar levels to mental health.
Some of these chemical messengers can boost health, but others can hinder it.