Fart Myths Debunked
Flatulence is surrounded by a fog of folklore, polite fiction, and outright misinformation. Some myths are comforting (nobody else does it as much). Some are alarming (you could explode). Some are simply unfair (only men do it). Science has addressed all of them with the rigor they deserve — which is to say, a surprising amount.
Myth 1: Women Don't Fart
This is perhaps the most persistent and demonstrably false myth in human biology. Biological sex has no meaningful effect on intestinal gas production. Both males and females have identical digestive anatomy, harbor similar gut microbiomes, and consume similar diets — all the variables that actually determine flatulence frequency. A 1998 controlled study by Suarez et al. published in Gut specifically compared flatus volume and frequency between sexes on identical diets and found no significant difference. The persistence of this myth is a product of differential social enforcement: women face stronger social penalties for visible flatulence, driving suppression behavior rather than actual reduced production. The gas is there. The rules are different.
Myth 2: Lighting a Fart Is Safe
The 'blue dart' — igniting a fart with a lighter — is documented, real, and carries genuine risks. The myth that it is harmless is contradicted by emergency room records. The risks include singed hair on the legs and buttocks, burns to the perineal skin (which is notably thin and sensitive), and ignition of clothing. Beyond personal injury, the practice occasionally succeeds with unexpected vigor when methane concentration happens to be high, producing flames larger than anticipated. More critically, attempting the act in enclosed spaces with accumulated gas (a particularly sealed room, for instance) creates an explosive risk, though this requires unrealistic gas concentrations. The procedure is best classified as 'technically possible, medically inadvisable.'
Myth 3: Holding In Gas Causes It to Disappear
As covered in detail in our article on holding in farts, retained gas does not vanish. Small amounts of carbon dioxide and hydrogen are absorbed through the colon wall and exhaled via the lungs, but this process handles only a fraction of the retained volume. The majority either redistributes to the proximal colon (causing bloating) or is expelled later — often during sleep. The corollary myth — that holding in gas causes explosions or ruptures — is equally false in the other direction. The colon is highly compliant and can accommodate volumes far beyond normal gas production before structural failure would occur. Both extremes of this myth are wrong.
Myth 4: Vegetarians Fart More
This myth has a kernel of truth wrapped in significant oversimplification. Plant-based diets are richer in fermentable carbohydrates (FODMAPs), which gut bacteria ferment into gas more readily than animal proteins. A new vegetarian transitioning from a low-fiber diet will likely experience temporarily increased flatulence as their gut microbiome adapts — a process that typically takes several weeks. However, long-term vegetarians and vegans often develop a gut flora composition that is more efficient at fermentation, paradoxically sometimes producing less gas than expected. Meat-heavy diets produce less fermentation gas but more hydrogen sulfide, which is responsible for the smell. So while vegetarian farts may be more frequent, carnivore farts often smell worse.
Did You Know?
- A 1998 study in Gut (Suarez et al.) found no significant difference in flatus volume between men and women on identical diets.
- The colon can distend to several times its resting diameter before structural failure — gas retention does not cause explosions.
- New vegetarians often experience temporarily increased flatulence for 2–4 weeks as their microbiome adapts.
- Hydrogen sulfide — the primary odor compound in farts — is actually produced more abundantly on high-protein, meat-heavy diets.
Fun Fact
The idea that women don't fart was so culturally entrenched in Victorian England that the first edition of Enquire Within Upon Everything (1856), a popular household guide, listed holding in gas as an act of feminine virtue — without a trace of irony.
Sources
- Suarez, F.L. et al. (1998). Insights into human colonic physiology obtained from the study of flatus composition. American Journal of Physiology, 272(5), G1028–G1033.
- Serra, J. et al. (2001). Impaired transit and tolerance of intestinal gas in the irritable bowel syndrome. Gut, 48(1), 14–19.
- Gibson, P.R. & Shepherd, S.J. (2010). Evidence-based dietary management of functional gastrointestinal symptoms: the FODMAP approach. Journal of Gastroenterology and Hepatology, 25(2), 252–258.
- Levitt, M.D. et al. (1976). Studies of a flatulent patient. New England Journal of Medicine, 295(5), 260–262.