Why Is My Poop Green?

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You can ask the Internet anything you want -- like, how big is the universe?

Or what’s the average lifespan of an Olive Ridley sea turtle?

Or why are sloths so lazy?

But many of you turn to the wisdom of the Internet to explain what you find in the toilet


According to our friends at Google, one of the most commonly googled questions in the

world -- at least in English -- is: why is my poop green?

And hey, fair enough.

We’re all about fostering curiosity here, and what’s more fascinating than the human


So in order to answer this question, we should really start with why poop is normally brown?

The brown color of most mammalian feces comes from a substance called bilirubin, which is

produced by your liver when it processes dead, used-up red blood cells and prepares them

to be excreted.

The bilirubin is actually made from hemoglobin, the protein that your blood cells use to ferry

oxygen around your body.

But even though your red blood cells are red, the bilirubin itself is yellow.

And it’s absorbed by your liver and excreted as bile, which is yellowish green because

of all the bilirubin in it.

The liver secretes bile into your small intestine, where its main job is to digest fats, breaking

down lipid molecules into fatty acids.