Why does human feces stink so much, and why does human feces stink

Under normal circumstances, the smell is the taste of indole and skatin produced by food after digestion and decomposition.

If it is fishy and abnormal, it may be that there is something wrong with your intestines, and the foul smell of stool is mostly due to eating high-protein foods or meat, and the incidence of bowel cancer will increase in the long run. The stool has a pungent and sour smell, most of which are fermentation indigestion, which is the consequence of "food stagnation", and hawthorn can be eaten to promote digestion.

charred stools with a fishy odor, suggesting gastrointestinal bleeding and heavy bleeding; Watery stools with a rancid smell of meat or fish, which is a sign of the decomposition of a large amount of blood or mucus in the intestines; Broth-like stools with a foul smell are more common in hemorrhagic necrotizing inflammation of the small intestine. Bowel movements are a normal physiological phenomenon for everyone, but when the stool is too smelly, you should pay attention to your intestinal health.

Almost everyone's poop is smelly, but if the bowel movement is too stinky, smelly, and smelly, it's not normal. There are many reasons for this, but the substances that ultimately cause feces to smell are not complicated, which are nothing more than amines, indoles, hydrogen sulfide and stinky feces. They mainly come from the intestinal flora to break down undigested and absorbed food components, especially proteins or other sulfur-containing substances.

Anything that causes a significant increase in protein or other sulfur-containing substances in the large intestine can cause stool to be too smelly.

1.Dietary intake is high in protein.

A small part of the protein contained in high-protein foods such as fish, meat, eggs, milk, and soybeans that we consume every day cannot be digested and absorbed by the small intestine, so it enters the large intestine and is decomposed and utilized by bacteria in the large intestine (physiology calls it "putrefaction"), and produces odorous components such as amines, indoles, and hydrogen sulfide. If you eat a high-protein diet, a large amount of unabsorbed protein will enter the large intestine, and the putrefaction will be "vigorous" and the smell will bloom.

It should be emphasized that the protein of meat, eggs and other foods contains more sulfur (sulfur-containing amino acids), which is much more than that of soybean products, and sulfur will generate hydrogen sulfide in the spoilage of coliform bacteria, and hydrogen sulfide is extremely smelly, so if you consume more meat or eggs, the poop will be more smelly.

It is worth noting that although vegetables such as garlic, onions, and radishes are not high-protein foods, they also contain more sulfur (sulfides), which are also converted into hydrogen sulfide under the action of coliform bacteria, which makes the feces smell more odorous. Therefore, a vegetarian diet sometimes does not prevent the smell of stool.

2.Poor digestion and absorption.

In the case of the elderly, indigestion, lack of gastric acid, etc., the digestion and absorption ability is reduced, and many of the proteins consumed in the normal diet are not absorbed, and enter the large intestine under the action of bacterial spoilage, making the feces more smelly.

Lactose intolerance is another common cause, as some people have a lack of lactase in the small intestine and are unable to digest the lactose in milk after ingestion. On the one hand, lactose enters the large intestine and is fermented by bacteria, producing gas (a lot of fart) and foul smell (not a foul smell); On the other hand, it also shortens the residence time of milk protein in the small intestine, so that some proteins and their digestive products do not have time to be completely absorbed, and enter the large intestine to make the feces more smelly under the action of bacterial putrefaction.

3.Intestinal diseases.

In bacterial enteritis (often accompanied by marked diarrhea), the stool is often fishy; Diseases such as intestinal Crohn's disease (an inflammatory disease of the intestine of unknown cause) and ulcerative colitis can also make poop smellier, which is related to the inability of food to be digested and absorbed properly, and on the other hand, it is also related to the imbalance of intestinal flora.

Because most of the odorous substances in feces are produced under the action of intestinal flora, the type of intestinal flora, whether it is strong spoilage (very smelly or foul-smelling) or fermentation (not smelly or sour), is directly related to the smell of poop.

In any case, from the perspective of the balance of intestinal flora, it is better not to smell too bad.

The smell of stool is caused by the decomposition products of bacteria, and the main components that produce odor are indole, skatosin, hydrocarbon, amine, acetic acid, butyric acid, etc. Among them, the fecal odor is indole and skein.

It is worth mentioning that many perfumes and flowers (such as jasmine) are fragrant because they contain a small amount of indole, but the concentration of indole in the feces is larger, which makes it smelly.

Food is digested in the stomach and small intestine, mainly by various digestive enzymes. The colon does not produce enzymes, only bacteria play a digestive role. There are many types of bacteria in the colon, Escherichia coli 70, anaerobic bacillus 20, as well as streptococcus, proteus, staphylococcus, lactobacillus, spores and yeast.

There are also very few protozoa and spirochetes. The important role of intestinal bacteria is to produce substances that are physiologically needed, such as vitamin K, vitamin B1, B2, vitamin H, vitamin B12, B6, folic acid and racemic pantothenic acid can be synthesized in the intestine when food is deficient. It can also produce indole, skatin, hydrogen sulfide to make the feces smelly.

Stool accumulates in the intestines for a long time, just like food that spoils and smells bad when left in a high temperature environment for a long time. When the intestines are warm, the stool will quickly "spoil", which is why it stinks.

People who often eat meat have stools that are also easy to stink and constipation, so it is best to eat more vegetables, especially crude fiber vegetables, so that the intestines are smooth, reduce the time for feces to accumulate in the intestines, and the stool will not be very smelly.

Drinking some tea to cleanse the intestines will have some effect, it will promote bowel movement, so that the stool is expelled as soon as possible, so that it does not accumulate in the intestines.

In short, it is best to develop a good habit of eating more vegetables than drinking tea that cleanses the intestines.

The main components of stool odor are indole, skatosin, hydrogen sulfide, amine, acetic acid, butyric acid, etc.

Among them, the one that produces a fecal odor is indole, skatosin.

This is a substance formed by the breakdown of proteins by bacteria in the intestines. In other words, if you tend to eat a European and American diet and consume a lot of high protein, your stool will become smelly.