Why Do Some Farts Smell Like Eggs? 5 Different Types of Flatulence, Decoded For Your Reading Pleasure

A picture shows a building with giant letters on the rooftop composing the word 'Fart' at the Metropoliz Museum of the Other and the Elsewhere (MAAM) which is also home to 200 squatters, including Roma and people coming from all corners of the globe, on November 25, 2014 in Rome. Situated in a part of Rome few tourists ever reach, the MAAM takes the concept of the warehouse gallery into a new dimension. Located in an abandoned salami factory on the Italian capital's eastern periphery, the museum is also home to 200 squatters whose precarious situation is an integral part of what Giorgio de Finis, the project's creator, describes as a living, breathing artwork. AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)
Source: ALBERTO PIZZOLI/AFP/Getty Images

They are your most constant companions in this life, loyally following you from yoga class, to a crowded elevator, to an important business meeting with your boss, to an important naked meeting with your partner — but how much do you actually know about your own farts? While they are among the most loathed of bodily functions, farts — sometimes even the ones that smell like rotten eggs — are actually a sign that your digestive system is working properly, and they can give you a lot of information about your health. Information that will make you unpopular at parties, yes, but important information, nonetheless.

So what are farts, even? They're a mix of swallowed air (that'd be all the air that passes through your mouth — whether it is via chewing gum, drinking carbonated beverages like beer or soda, eating very quickly, and/or having breathless, gasping conversations about how boring this season of American Horror Story was) and gas produced by the bacteria in your lower intestine. 

The bacteria in your intestines create gases as they they breakdown sugars and starches that your body can't easily digest — which includes beans, most vegetables, and whole grain breads, and all the other super-healthy foods that make trips to the vegan restaurant so odorific. The bacteria breakdown process produces roughly between 2 and 6 cups of gas a day, and after it builds up, it needs to come out somewhere. That somewhere is your butthole, where this mix of swallowed air and intestinal gas makes its break for the general populace, often up to 18 times a day.

Regular farting is a sign that you're consuming enough fiber, and have a healthy collection of bacteria in your intestines. But what do the subtle variations in the smells and frequency of your farts — the "flavor notes," if you will — mean? Read on to find out. If nothing else, I can guarantee that by the end of this post, you'll be wondering about how often Gwyneth Paltrow farts (because the answer has to be "a lot. Like, A LOT").

Scentless Farts

Most of the gas that we expel is actually free of any scent — which is why you may currently be indignantly thinking, "Maybe you fart two cups of gas a day, you ass-mare of a woman, but I DEFINITELY do not." Most of the gas expelled by our intestines is carbon dioxide, or other gases with no scent. So, a hearty amount of smell-free farts is healthy and normal ... in fact, they are so normal, they may not even register for you. So stop being so self-righteous! You're just as farty as the rest of us, buddy.

Smelly Farts

About one percent of the gas produced by our intestines is not scent-free, as I am sure you have noticed. That scent is generally hydrogen sulfide, a gas that is created when your body breaks down foods with sulfur in them. What foods have sulfur in them? Pretty much anything with a rep as a gas-inducing food —like broccoli, cauliflower, dairy, beans, and other nommables that make no one want to sit next to you at the movies. Red meat, which contains a compound called thiols, can also lead to you emitting a pointed stank later on.

But however unpleasant you may find mildly smelly farts to be, they're totally healthy and natural. I know that doesn't make you feel any better about smelling a stranger's farts on the bus, but it's true (and there actually may be health benefits to smelling a stranger's farts ... does that help? No? Sorry, I'll stop. I was wrong to have even tried!).

Really Smelly Farts

Supposedly, we're very bad judges of how bad our own farts smell — like the weird clicking noise our jaw makes or our compulsion to eat a whole jar of olives in one sitting, our unique fart bouquets are personal quirks that we've gotten used to over the course of our lives. But sometimes, even we can tell that the fumes from down below are worse than usual. Those especially sulfuric farts —the ones that lead to teary eyes, pointed fingers, broken friendships, and shouts about "rotten eggs" — are often the product of heavy consumption of hydrogen sulfide-producing foods, like beans and broccoli, or generally maintaining a very high fiber diet.

But really atrocious farts aren't always a just sign that you're eating healthily — they can also be a sign that you have lactose intolerance. Even if consuming dairy products doesn't make you feel ill, breaking into a stanky fart symphony immediately after consuming dairy means that your body is having a hard time breaking down the lactose. Less commonly, frequent and extremely stanky farts can be a sign of a chronic problem, like irritable bowel syndrome or celiac disease, or an infection like gastroenteritis.

Silent Farts

The sound that your fart makes when it comes out has nothing to do with its content — it's simply about the position of your sphincter when the gas is pushed out. That goes for silent farts, loud farts, brief farts, drawn-out farts, or a rapid-fire series of farts. There's no secret information to be gleaned from the length or tune of your toots — except that you probably recent consumed some form of musical fruit.

Frequent Farts

The average person farts 10-15 times a day. There's wiggle room on either side of that figure that can still be considered normal, but if you find yourself farting more than 22 times a day, you may be engaging in some behavior or eating a food that is pumping more air into your guts. None of it is particularly hazardous to your health, and almost all of it can be easily changed: you could be drinking a lot of coffee (which relaxes the sphincter, letting farts slip out more often), eating tons of carbs and other foods that are difficult for your intestines to break down, consuming a vegetarian diet, or even just eating your food really quickly (which can lead to swallowing lots of air). 

In rare cases, frequent farting can signal an affliction called small intestinal bacterial overgrowth, which means that the small intestine is home too too many bacteria, which can cause excess gas and bloating

But most of the time, frequent farting is nothing to worry about (from a health perspective, I mean. From a "not alienating everyone else in my open-plan office" perspective, well, we'll have to have a separate discussion about that one later).

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