It’s a funny sound that’s commonly associated with a rotten stench. While many might not be a fan of these expulsions of gas, the alternative is that our insides explode as a result of pressure buildup, so farts are probably the better option there.

But what makes these gaseous releases so smell? It’s largely due to the nearly 4 pounds or 2 kilograms of microorganisms that live in our colon.
Bacteria in our colon produce a third of a liter of hydrogen per gram of carb they consume. Some bacteria take carbs and create hydrogen sulfide, which is a source of rotten egg smells. Other microbes make methane. Other microbes make ammonia.

Essentially, farts stink because different microbes produce different smelly gases that our body then has to expunge.

But what’s the actual breakdown?

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