Once you say it, it is shocking that farts contain 400 components. Among the gas components, except for nitrogen and oxygen, the vast majority of gases are produced by bacteria in the intestine. The main components are nitrogen, hydrogen, carbon dioxide, methane, oxygen and other non-odorous gases, and trace amounts of ammonia, hydrogen sulfide, fecal odorants, volatile amines, volatile fatty acids and other gases that form malodors. Even if all the gases that produce bad odor are concentrated, they only account for less than 1% of the content of discharged farts. The human sense of smell is so sensitive that it can detect even one part per billion of the substance. Therefore, people will find farts very smelly. And it is quite surprising that it was NASA that did this research. They were in the Apollo program for the “fart” to carry out research. The general public may think, NASA’s Apollo program and farts associated with the really incredible. However, this is a very important safety issue for the management of the interior of the spacecraft. If the astronaut’s farts contain flammable gases and are not properly handled, they may ignite under certain circumstances and cause an explosion or fire in the spacecraft. In addition, the spacecraft is a confined space can not easily regulate the air, so we must also consider that the astronauts may not be able to empty their farts to outer space and poisoning. More than ten farts a day, too much too little are a problem. Farting is a physiological activity in which the human gastrointestinal tract expels the foul gas from the intestinal cavity through voluntary peristalsis. The presence or absence of farts or the amount of farts is not a trivial matter, but it is closely related to the health condition of a person, which not only reflects gastrointestinal diseases and functions, but also may reflect whether certain organs of the body are normal. If a person does not exhaust for a day, the stomach may be bloated. Under normal circumstances, there are about 150-200ml of gas in the digestive tract, and the gas is discharged either upward from the mouth as erratic (burping) or downward from the anus as farts. Under normal diet, people will release 10-18 farts every day, either consciously or unconsciously, with a total volume of about 400-2400ml, and sometimes they may not even realize it. Farting is a signal of gastrointestinal function, and there is no big difference between men and women. If a person does not fart, or keeps farting all day long, it may indicate that something is wrong with the body. For example, if a person does not fart for several days, does not poop and has abdominal pain, it is often a sign of intestinal obstruction; if the fart is loud, it may be related to indigestion or excessive meat consumption; if the fart sounds like thunder, but does not smell too bad, it is mostly due to gluttony of food containing too much starch. For example, in elderly people and those with habitual constipation, the lack of tension in the intestinal cavity, poor propulsion, long residence time of food residues and more gas production are the reasons for more farts. Frequent farting, regardless of the reason, should be regarded as a pathology that needs to be managed. Why do some people’s farts stink so badly while others do not smell at all? Our explanation is that farts have different odors depending on the food intake. If bacteria in the intestine produce excessive hydrogen sulfide, fecal odorants, short-bonded fatty acids and indigo substrates, the farts will smell bad, and usually plant nectars, bean sugars and oligosaccharides in legumes are particularly smelly. Another point is that proteins and meat decomposed in the intestine will later become sulfides, and if the sulfide content is high, the farts will be more smelly. Most of the people who fart are constipated, the feces stay in the body for too long, the sulfide content in the intestinal gas increases, the fart will be full of bad smell. In addition to the relationship between diet, we believe that the strange and unpleasant farts may also be a warning sign of some diseases. For example, if you have indigestion or constipation; if you have a lot of farts combined with changes in bowel habits and abdominal pain, and if it affects your daily life, it is best to seek medical attention, as this may be a warning sign of a gastrointestinal tumor. Kang Liang pointed out that we should pay more attention to our “farts” and use it as a mirror to check our health status at any time. In clinical practice, no farts are more dangerous than many farts. No farts and abdominal distension, mostly due to a “blockage” of the intestinal tract, most commonly seen in intestinal obstruction, intestinal torsion, or due to intestinal paralysis and can not drive the gas “out”. Gastrointestinal surgeons pay special attention to the farting information of post-surgical patients, and greet post-surgical patients: Did you fart today? is their mantra. The purpose is to pray for “a loud fart to report peace”: when the patient has farted, the doctor’s heart will be relieved, because it means that the intestine was turned during the operation is clear, and the function has basically been restored. Many people often hold back farts in order to save face, often holding back farts, the stench accumulated in the body will lead to abdominal pain, so that the digestion and absorption function is reduced, and even affect the excretion of stool; and people in constipation, the colon will accumulate more harmful substances, producing more waste gas, thus forming a vicious circle. If you can not discharge these waste gases in the body for a long time, the organs in the body will be seriously affected, especially the liver, such as the burden of detoxification organs increased, in the long run, will weaken the detoxification function of the liver. Suggestions: To develop good bowel habits, avoid constipation, strengthen physical exercise and improve gastrointestinal function is the key to improve the annoying “fart”. In addition, in daily life should pay attention to eating should not be too fast and too urgent, so as not to swallow too much air; for easy gas-producing food such as onions, or easy to enhance the gastrointestinal peristalsis of food such as bananas, etc., should not eat too much at one time; try to eat less or do not eat cold, greasy, fried and stir-fried food that is difficult to digest.