Why Is Poop Brown And Pee Yellow?

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The pigments in our food all get destroyed on their way through our digestive system…so where do the colors of our poop and pee come from?

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FYI: We try to leave jargon out of our videos, but if you want to learn more about this topic, here are some keywords to get your googling started:
– Red blood cells (RBCs), also called erythrocytes, are the most common type of blood cell and the vertebrate’s principal means of delivering oxygen
– Hemoglobin also spelled haemoglobin and abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates as well as the tissues of some invertebrates.
– Bilirubin is a yellow compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates.
– Urobilinogen is a colourless by-product of bilirubin reduction. It is formed in the intestines by bacterial action on bilirubin. About half of the urobilinogen formed is reabsorbed and taken up via the portal vein to the liver, enters circulation and is excreted by the kidney.
– Urobilin or urochrome is the chemical primarily responsible for the yellow color of urine.
– Stercobilin is the chemical responsible for the brown color of human feces”
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Credits (and Twitter handles):
Script Writer: Will Tauxe
Script Editor: Emily Elert (@eelert)
Video Illustrator: Ever Salazar (@eversalazar)
Video Director: Emily Elert (@eelert)
Video Narrator: Emily Elert (@eelert)
With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Peter Reich, David Goldenberg
Music by: Nathaniel Schroeder:
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