How Fast Does Your Body Refresh Itself? : Shots - Health News Almost all of the cells in a human body get replaced over the course of a life. NPR's Skunk Bear Team sets off on an imagined video tour inside the body to find out which body parts never change.
NPR logo Does Your Body Really Refresh Itself Every 7 Years?

Does Your Body Really Refresh Itself Every 7 Years?

NPR's Skunk Bear YouTube

The latest episode of the podcast Invisibilia explores the idea that personality — something a lot of us think of as immutable — can change over time.

That got Invisibilia co-host Lulu Miller wondering if anything about us stays the same. Do all the cells in our body turn over every seven years as is sometimes claimed, with new cells replacing old ones? Or is there something that we hang on to for life?

The Personality Myth

We like to think of our own personalities, and those of our family and friends, as predictable, constant over time. But what if they aren't? What if nothing stays constant over a lifetime? Explore that enigma in the latest episode of the NPR podcast Invisibilia.

NPR's Skunk Bear crew decided to answer that question with a video.

It turns out that each body part has its own very distinct lifespan. The lining of the stomach, constantly under assault by digestive acid, is renewed every few days. But bones are refreshed once a decade. And there are a few parts of you that stay with you from birth to death.


Listen to the latest episode of Invisibilia and all the others here, and see what else Skunk Bear has been up to here. Would you like Skunk Bear to answer your science question in a future video? Post your question in Skunk Bear's YouTube comments and it might get picked!

Skunk Bear/NPR
Cell types examined in the Skunk Bear video.
Skunk Bear/NPR