Scientists have developed "Smart Underwear", a wearable device built into underwear that measures gas by detecting hydrogen produced by gut microbes.[1][2] Early tests showed that humans can pass gas about 32 times a day, exceeding previous estimates.[1] The device makes it possible to monitor intestinal microbial activity in real time during everyday life.[1][2] Increased fiber intake led to higher hydrogen production, which the device reliably recorded.[1] The Human Flatus Atlas Project, led by University of Maryland gastroenterologist Brantley Hall, maps normal gas production patterns across the population.[1][2][4] The study included three groups of participants: those on a high-fiber diet with low gas, those with excessive gas, and a "normal" group in between.[2][4] The goal is to create reference values for evaluating the impact of diet and probiotics on the intestinal microbiome.[1][4] An associated mobile app tracks meals with photos and correlates them with gas measurements.[6]