Exhaust gas, commonly known as "farting", is a bit indecent to talk about, but it is indeed a normal physiological condition of human beings. Generally speaking, scientists believe that the number of times a normal person exhausts gas is between 10 and 20 times a day. If it is too much or too little, it can be used as an indicator of physical health.

However, a recent study overturns this theory, suggesting that humans actually emit gas more frequently than previously thought.

A research team from the University of Maryland in the United States was responsible for this study. They found that the exhaust king can exhaust 40-50 times a day. On the other extreme, the "silent king" may only exhaust 4 times a day.

For most ordinary people, the average person farts 32 times a day, which is much higher than the previous standard of 10-20 times.


Why is there such a big gap between the exhaust frequency of normal people?

It turns out that scientists have recently invented a device that is convenient and can track "farts" in real time - a wearable fart meter.

It is only about the size of a silver coin and can be clipped to ordinary underwear. It will record the time, duration and intensity of each exhaust gas. The user can hardly feel its existence. It can be worn all day long, and it can measure the amount of human fart production in real time for a long time.


In the past, doctors mostly relied on the patients' self-reported exhaust conditions to assist in diagnosis. However, in fact, relying on people to count or calculate the number of exhaust times is definitely inaccurate, because it is impossible for people to count and remember in real time.

It is possible that the person remembered it incorrectly, that he or she forgot to count, or that the gas was secretly discharged without the person having any "consciousness".

The wearable fart meter can be worn for a long time and can not only track in real time, but also is a more direct measurement method compared to conventional exhalation tests, so it can also more scientifically reveal the "baseline and dynamic changes" of normal fart volume.


It works by using small sensors to continuously record the release of hydrogen and other gases from the intestines.

The hydrogen content in the air is very small, but hydrogen is one of the main components in human exhaust. It is a by-product produced by the microorganisms in the intestines fermenting undigested carbohydrates.

Therefore, tracking hydrogen gas can directly reflect the activity of intestinal microorganisms. In some cases, if the intestines are healthy, the amount of hydrogen will be greater; if the intestines are prone to gas, the amount of hydrogen will be less.

In this study, scientists initially recruited 19 volunteers and asked them to wear the device for a week when they were awake, wearing it for an average of more than 11 hours a day (the volunteers all said they were able to accept wearing the device and it would not affect their daily lives).

During this period, their exhaust data and their feces samples were collected for examination. After multiple studies, the initial conclusion was reached.


△ Someone can use "fart" to perform a show, with precise control to let it go as they say.

Scientists believe that this device can be imagined as a continuous blood glucose monitor, except that the object detected is "fart" and the sensitivity is also very high, as high as 94.7%.

Next, scientists will continue to recruit volunteers. Anyone over 18 years old and living in the United States can participate in this study. The research team will send them a device that can record their "farts" after wearing it.

The ultimate goal of the research team is to draw a national "human exhaust map" and then redefine the normal frequency of "fart production."