Why Is Poop Brown And Pee Yellow?

The video explains how the colors of our food are destroyed during digestion, leaving a grayish mass. The pigments in our waste come from blood, not food. Red blood cells, which cannot repair themselves, are recycled for iron, leaving bilirubin as a byproduct. The liver attempts to remove bilirubin, but it cycles back into the bloodstream. Gut bacteria break this cycle by converting bilirubin into urobilinogen, which can exit the body via two routes: through the kidneys as yellow urine or through the intestines as brown feces.

Describe the process by which urobilinogen is handled in the body.

How do bacteria in the intestines contribute to the final color of our poop?