What makes fart smell bad?”
The gas released during a flatus event frequently has a foul odor which mainly results from low molecular weight fatty acids such as butyric acid (rancid butter smell) and reduced sulfur compounds such as hydrogen sulfide (rotten egg smell) and carbonyl sulfide that are the result of protein breakdown. The incidence of odoriferous compounds in flatus increases from herbivores, such as cattle, through omnivores to carnivorous species, such as cats. Flatulence odor can also occur when there is a number of bacteria and/or feces in the anus while being expelled. You can buy something called Beano to help prevent flatulence. Beano is an enzyme-based dietary supplement that is alleged by its manufacturer to reduce gas in the digestive tract, thereby preventing flatulence. It contains the enzyme alpha galactosidase. It is claimed that the human digestive tract does not contain alpha galactosidase; however acarbose may work against alpha galactosidase in the human gut; this enzyme breaks down
