What is a fart and why does it smell?

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Ever pull someone's finger and hear a weird noise come out of his or her butt?

Ever sit in a tub of water and see bubbles come out of your hiney?

This strange noise and vibrating sensation that came from your butt is most likely caused by a fart.

A fart is a combination of gases (nitrogen, carbon dioxide, oxygen, methane, and hydrogen sulfide) that travels from a person's stomach to their anus. When a person swallows too much air or eats foods that the human digestive system cannot digest easily gas becomes trapped in his/her stomach. The only way for this excess gas to exit the body is through the anus.

The gas that makes your farts stink is the hydrogen sulfide gas. This gas contains sulfur which causes farts to have a smelly odor. The more sulfur rich your diet, the more your farts will stink. Some foods that cause really smelly farts include: beans, cabbage, cheese, soda, and eggs.

A scientific name for a fart is flatus or flatulence.

The word fart is just one of many different terms used to describe the release of gasses from the human body. Other popular names for farts or farting include: gassers, stinkers, air biscuits, bombers, barking spiders, rotten eggs, and wet ones. You can pass gas, break wind, blast, beef, poof, rip one, let one fly, step on a duck, and cut the cheese.

Farts can be stinky, wet, loud, or silent but deadly. Pee-eeew!!!
Did you know?

* On the average, a healthy person farts 16 times a day.
* Hey guys, don't be fooled by girls who tell you that they never fart. Everyone farts, including girls. In fact, females fart just as much as males.
* Many animals fart too. Cats, dogs, and cows. Elephants fart the most.
* People fart the most in their sleep.
* Farts that contain a large amount of methane & hydrogen can be flammable.

All people fart sometimes 

P.U.! What's that smell? How can your body make something so stinky?

Farts - also called flatus (say: flay-tus) or intestinal (say: in-tes-tuh-null) gas - are made of, well, gas!

When you eat, you don't swallow just your food. You also swallow air, which contains gases like nitrogen (say: ny-truh-jen) and oxygen (say: ahk-sih-jen). Small amounts of these gases travel through your digestive system as you digest your food. Other gases like hydrogen (say: hy-droh-jen), carbon dioxide (say: kar-bon dy-ahk-side, the gas that makes soda fizzy), and methane (say: meth-ain) are made when food is broken down in the large intestine. All of these gases in the digestive system have to escape somehow, so they come out as farts!

Gases are also what can make farts smell bad. Tiny amounts of hydrogen, carbon dioxide, and methane combine with hydrogen sulfide (say: suhl-fide) and ammonia (say: uh-mow-nyuh) in the large intestine to give gas its smell. Phew!

All people fart sometimes, whether they live in France, the Fiji islands, or Fresno, California! If you have a dog, you may have even been unlucky enough to have heard (or smelled) Fido farting. Intestinal gas is totally normal, and it's very rare for farting to be a sign that something is wrong in the body.

If you want to be less farty, try cutting back on foods like beans, onions, and fried foods. These can release larger amounts of gas as they break down in your body. If you have a lot of gas after you eat ice cream, yogurt, or milk, talk to your parent about it - your body may have a difficult time digesting the natural sugar called lactose, which is found in dairy foods. And don't forget that farting can sometimes be your body's sign that it's time to take a trip to the bathroom.

The bathroom is also a good place to go if you're feeling particularly gassy because it's not polite to fart in social settings, like in class or at the dinner table (Yuck!). But don't worry if this happens accidentally. Just remember to say "excuse me!"

Reviewed by: Mary L. Gavin, MD
Date reviewed: May 2006

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