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Why do farts smell the way they do? And why are the smells always so different?

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The odor of farts comes from small amounts of hydrogen sulfide gas and mercaptans in the mixture. These compounds contain sulfur. Nitrogen-rich compounds such as skatole and indole also add to the stench of farts. The more sulfur-rich your diet, the more sulfides and mercaptans will be produced by the bacteria in your guts, and the more your farts will stink. Foods such as cauliflower, eggs and meat are notorious for producing smelly farts, whereas beans produce large amounts of not particularly stinky farts.

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That helps alot. Thanx. No I will eat less sulfur
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You are very welcome! Good luck to you! :)
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and when you're lactose intolerant like my wife, ANYTHING will produce an eye watering-gag induced bomb ! had to drop and roll out of bed a few times
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CJ... the Fart Master. Awesome.
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Lmbo.
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CJ really impressive stuff. If you've never read the Arabian Nights you might enjoy this story. It's very short. http://www.tomthumb.org/422/the-tale-of-abu-hasan-and-the-fart-1001-nights/
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The smell from the first depends on the chemical generation in the body. These are the sulfur rich compounds which combine with the bacteria to produce different types of smell. You can learn more at http://www.heptune.com/farts.html and http://www.kidzworld.com/article/473-the-science-of-farting#.

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Scientifically speaking, its a combination of wind and $hit stank in your body. Then the breakage of wind thus blowing the $hit stank up everyone's nostrils. The smell is dependant on what you ate only doesn't smell quite as good on the flip side.

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While I respect the knowledge and erudition of the previous answers they have all missed the very simple truth.

Farts smell the way they do so that deaf people can enjoy them too.

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Oldie but a goodie! I'd completely forgotten that one.
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When they're old enough they're almost new again.
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And here I thought you were gonna tell your smells like roses story.....
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Not sure I know that one, Yosey.
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Maybe is was part of another story? I seem to remember a story about it smelling like flowers....I could be mistaken.....me and my bird brain....
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