GoKawiilA new nationwide study is recruiting volunteers to map the full spectrum of human flatulence.
Hall's team demoing a Smart Underwear Prototype. Credit: University of Maryland.
Scientists at the University of Maryland have created Smart Underwear, the first wearable device designed to measure human flatulence. By tracking hydrogen in flatus, the device helps scientists revisit long-standing assumptions about how often people actually fart. It also opens a new window into measuring gut microbial metabolism in everyday life.
For decades, physicians have struggled to help patients with intestinal gas complaints. As gastroenterologist Michael Levitt wrote in 2000: “It is virtually impossible for the physician to objectively document the existence of excessive gas using currently available tests.”
To address this challenge, researchers led by Brantley Hall, an assistant professor in the Department of Cell Biology and Molecular Genetics at UMD, developed Smart Underwear—a tiny wearable device that snaps discreetly onto any underwear and uses electrochemical sensors to track intestinal gas production around the clock. In a study published in Biosensors and Bioelectronics: X, a team led by UMD assistant research scientist Santiago Botasini found that healthy adults produced flatus an average of 32 times per day, roughly double the 14 (±6) daily events often reported in medical literature. Individual variation was extreme, with daily totals ranging from as few as four flatus events to as many as 59.
So why were older estimates so much lower? Previous research relied on invasive techniques in small studies or self-reporting, which suffers from missed events, imperfect memory and the impossibility of logging gas while asleep. Visceral sensitivity also varies widely: two people can produce similar amounts of flatus yet experience it very differently.
"Objective measurement gives us an opportunity to increase scientific rigor in an area that's been difficult to study," said Hall, the study’s senior author.
In most people, flatus consists mainly of hydrogen, carbon dioxide and nitrogen. Some individuals’ flatus also contain methane. Because hydrogen is produced exclusively by gut microbes, continuously tracking hydrogen in flatus provides a direct readout of when and how actively the gut microbiome is fermenting dietary substrates.
“Think of it like a continuous glucose monitor, but for intestinal gas,” Hall said, noting the device successfully detected increased hydrogen production following consumption of inulin, a prebiotic fiber, with 94.7% sensitivity.
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