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Why do we hate feces?

via:驱动之家     time:2021/7/25 23:19:48     readed:157

As part of the game night party, the trickster will create a prank. He will take out a box containing a mysterious object, let the player cover his eyes, and identify it only by double touch and nose sniffing.

When the player carefully puts his hand into the box and feels that the object is very wet, soft, sticky and smelly, he will immediately jump up from the chair madly because it feels too like feces!

But in fact, the trickster is a mixture of yogurt and bread crumbs.

Not that we should touch the feces to know its texture accurately, butOur brain has a strong cognitive concept of touching feces, and we will stay away from anything that smells like feces.

How does the human body make feces? What is the composition of feces?

In order to survive, human beings must obtain nutrients from food to maintain body metabolism. When we eat food, the food will enter the human digestive system. The small intestine will absorb 90% of the water in the food and absorb the nutrients our body needs from the food we just eat.

The rest is indigestible food, which passes through the large intestine, where it turns undigested food into feces.

The large intestine mainly absorbs the remaining water from undigested food, but the bacteria in the large intestine will digest more and finally excrete a mass of solidified feces.

There are three main components of feces: water, bacteria and undigested dietary fiber.75% of them are water, 25-54% of solid substances are living, dead, harmless and pathogenic bacteria, and incompletely digested food fiber.

Why does feces have a strong pungent smell?

The most disgusting thing is the special smell of feces, which is the result of intestinal microbial activities.

Feces release a lot of volatile gases. The most common gases are carbon dioxide, oxygen, hydrogen and methane, butThe root of malodorous odor is indole and stink, which is formed by the action of intestinal bacteria on the amino acid tryptophan, which exists in most diets.

Among these volatile compounds, stink has a strong smell, and people will have a strong sense of fear and disgust after inhalation.

Bacteria in human feces can cause some terrible diseases, such as cholera, food poisoning and diarrhea. In addition to our body's natural defense barrier (skin and complex immune system), we also have a behavioral immune system to prevent us from approaching potentially infectious objects, such as feces.

With evolution and natural selection, animals and species that managed to stay away from pathogens survived and completed evolution.

The behavior of avoiding disease is not unique to humans. Even lobsters will stay away from other sick lobsters!

Have we learned aversion?

Disgust, as an emotion, has aroused the great interest of many scientists. Various brain studies have shown that when we face the stimulation of disgust, there will be significant brain activity in the forebrain island and amygdala.

It's like we are naturally disgusted with our own excrement, because it poses a risk to human health. Feces have volatile components, pathogenic bacteria in feces and stench will make people have a general disgusting reaction, which is also part of the strategy to avoid diseases.

Disgust is a strong universal emotional response, but its intensity is different. Sometimes we feel disgusted, but some things may make you feel more disgusted.

In addition, in some cases, you may tolerate things that others feel disgusted. For example, the mother's aversion to the child's feces is far less than that seen on the street. In this case, the mother's aversion to the child's feces will actually be greatly reduced.

Humans eat every day and then excrete feces, which is repeated day by day. In fact, we should thank the human body for its aversion to feces. Excretion of feces is a disgusting inducer, so we usually stay away from feces and pathogenic bacteria carried by feces.

In short, people's aversion to feces does not always bring negative effects. Fortunately, the wonderful digestive system and behavioral immune system of the human body help human beings survive safely!

为什么我们会厌恶粪便?

- THE END -

Biological medicinefaeces

Original link:Sina Technology

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