A disgusting simulation breaks down why poop smells, and why it’s brown

A new wave of online curiosity about why faeces smell has put gut science back in the spotlight. A viral explainer and expert commentary highlight how bacteria, sulphur-rich foods and fatty acids create the odour, and why stool colour shifts from greenish bile to familiar brown. While usually harmless, persistently foul-smelling stools can signal underlying digestive issues, doctors warn.

A disgusting simulation breaks down why poop smells, and why it’s brown
A new wave of online curiosity about why faeces smell has put gut science back in the spotlight. A viral explainer and expert commentary highlight how bacteria, sulphur-rich foods and fatty acids create the odour, and why stool colour shifts from greenish bile to familiar brown. While usually harmless, persistently foul-smelling stools can signal underlying digestive issues, doctors warn.