omegaresnovae: Did you hear the news about Burger King's black bun burgers?

Bile or gall is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver, and stored and concentrated in the gallbladder. After eating, this stored bile is discharged into the duodenum. The composition of gallbladder bile is 97% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats (cholesterol, fatty acids and lecithin), and 200 meq/l inorganic salts.

As amphipathic molecules with hydrophobic and hydrophilic regions, conjugated bile salts sit at the lipid/water interface and, at the right concentration, form micelles. The added solubility of conjugated bile salts aids in their function by preventing passive re-absorption in the small intestine.

Bile acid-containing micelles aid lipases to digest lipids and bring them near the intestinal brush border membrane, which results in fat absorption.

These react with pigments already present in the contents of the intestine, in some cases changing certain properties on them, changes that are further affected by the bile pigments already present in the bile.

Now take whatever you understood from that, add it to what you know about the blackburgers and think why your poop comes out green - .-