What causes most parts of the human body to lose hair?

Because hair is no longer needed to protect against the cold, clothing has replaced hair, so most parts of the human body have lost hair.

It's because humans are constantly evolving and later they start to wear clothes, so most of the hair gradually fades, which is an evolutionary process.

This is a process that has been evolving for thousands of years. It is not subject to human consciousness.

"Everyone has hair on their body", this Internet buzzword, has drawn people's attention to body hair. Many people find that body hair gradually falls out with age. In fact, this is a normal phenomenon, after all, the hair itself is in a cycle of growth and shedding, and with the influence of metabolism, it will slowly become less and less.

As for which part of the body it is, how much or less it falls off depends entirely on the individual. Some people have bad lifestyle habits and may have lost a lot of hair before they reach the age of hair loss. And some people still have thick hair after they are in their seventies and eighties, and there are physiological factors and lifestyle factors, and everyone is different.

1. The growth and shedding of body hair is a role for human beings to keep out the cold. In ancient times, human beings did not have thick clothes, and their heating ability was weak, so they had a lot of body hair. With the continuous development and progress of human society, clothes gradually appeared, and body hair began to fade gradually.

However, it has not completely disappeared, after all, body hair also plays a role in perspiration and protection.

In life, we can also find that body hair is in the process of growing and shedding. For example, leg hair and beards, whether shaved or plucked, will eventually grow out, and may even become harder. The main reason for the obvious shedding is the speed of growth, which cannot keep up with the speed of shedding.

2. Why body hair falls outBody hair is a very normal thing, and the most fundamental reason is metabolic problems. The body's functions will slowly weaken with age, and this is a problem that people cannot change. Then when the function degenerates to a certain extent, the body's metabolism is not as strong as it used to be, and the growth rate of body hair cannot keep up.

At this time, it gives people the feeling that it falls off frequently.

In addition, there is an important reason that our lifestyle habits reduce metabolic capacity. For example, staying up late is the worst bad habit that hurts the body and loses hair the fastest. In addition, diet, exercise, work environment, etc., will affect the growth and loss of body hair.

3. Hair removal has become a trend In modern times, hair removal has become a trend, and both boys and girls have similar behaviors. Boys shave, and some even shave armpit hair and leg hair. Girls are similar, for the sake of beauty removal cream, beeswax, hair removal device is almost necessary.

Body hair has become a burden for most people, and they would rather fade away. Interestingly, however, most people have a steady stream of body hair, but hair is falling out all the time. Now hair loss has become a major problem faced by young people, and many people have also begun to transplant hair or maintain health.

Because the body's function declines at a certain age, and these hairs gradually age, they cannot grow new hairs, so they will slowly fade.

This is because after a certain age, the body secretes various things, and then it is no longer conducive to hair growth, so the hair will slowly fade.

Because when you reach a certain age, the nutrition in your body can't keep up, so the hair will slowly recede.

Any biological population, in the long process of survival, will always face the problem of adapting to the natural environment and its changes, so in the individual physiological characteristics and behavior patterns, will show corresponding changes, over time will determine the changes in these physiological characteristics and behavior patterns of the genes solidified, so that compared with the original genes, some parts of the gene have mutated. In fact, gene mutation is an indispensable change in the life process of any biological individual, but under the stress of the natural environment and its changes, the probability of gene mutation becomes greater and the time interval becomes shorter. When this genetic mutation is conducive to adaptation to the natural environment, the survival ability of the mutated organism becomes stronger, thus passing these genes on to the next generation in the form of inheritance.

There are several different explanations in the scientific community for the causes of the deterioration of body hair in human ancestors, among which the theory of heat dissipation, the theory of getting rid of parasites, and the theory of sexual selection are the most representative. However, getting rid of parasites does not perfectly explain why most of the body's body hair has degenerated, while the head, armpits, and private parts still have hair; Sexual selection, on the other hand, does not perfectly explain the consistency of body hair degeneration in male and female individuals. Therefore, getting rid of the parasite theory and the sexual selection theory have certain limitations, and the heat dissipation theory has become the most mainstream view in the scientific community.

The main driving factor for human ancestors to move from forests to grasslands was to obtain a wider living space and more abundant food on this basis**. However, human beings are limited by their own physiological factors, there is no absolute advantage of body size, there is no rapid speed, and there are no sharp teeth and claws, in the hunting process, the only physical advantage is endurance, can run at a certain speed for a long time, and this skill, few animals in nature can compare.

The ancestors of the humans who came to the grasslands were originally in Africa, where the temperature was generally high and the body was covered with thick hair, which undoubtedly caused a great burden on the body to dissipate heat during running. Therefore, in the process of adapting to the natural environment and behavior patterns, those human ancestors with thick body hair not only lack the endurance to run continuously, have low hunting ability and efficiency, but also face the threat of heat stroke and death at all times. And those human ancestors who are not very dense in body hair are usually able to catch more prey efficiently, and their health is not affected by anything, and they can survive better, so that in the long run, the remaining human ancestors generally have less body hair, so that this gene is passed on from generation to generation, and eventually most of the body hair on the human body is replaced by fine fluff, which is more conducive to sweating, and it is also more conducive to the heat in the body being taken away with the evaporation of sweat.

Introduction: As we all know, the evolution process of human beings and other animals is a very slow and very wonderful process, first of all, all kinds of animals we see in nature today are formed by hundreds of millions of years of evolution and evolution, even human beings themselves have gone through a long evolutionary process, before they evolved to the present appearance, in fact, some careful people will find that most animals have body hair or thick hair, and most parts of the human body hair have faded, what are the reasons for this? Next, I will analyze it for you.

1. Human migration.

Human civilization is a very wonderful thing is that I have traces of human existence in all corners of the world, many areas are very cold, but there are still many people living there, and some areas are very hot, and most of the people live in this kind of place, this is due to the frequent migration of human beings in the process of evolution, those who live in hot areas, will lose some body hair over time.

2. Human development.

With the evolution and development of human beings, human beings can gradually master a variety of tools, and even be able to manufacture a variety of complex products, such as cold clothing, when people feel cold, they will make a lot of cold and warm clothing, and even in hot areas, people will also make some clothing that covers important parts, so human beings will also lose a lot of useless body hair.

3. The wonder of nature.

Nature is a very wonderful system, flowers and plants in nature and all kinds of small animals are wonderful masterpieces of nature, human beings are also the products of nature, so people must be in awe of nature and respect nature at all times, only in this way can they better protect their habitat, people have not found that there are actually many things, at all times we must maintain the enthusiasm to explore, little by little to dig the wonders of nature.

The evolution process of human beings and other animals is a very slow and very wonderful process, first of all, all kinds of animals we see in nature are formed by hundreds of millions of years of evolution and evolution, and even human beings themselves have gone through a long evolutionary process to evolve to what they are today, in fact, some careful people will find that most animals have body hair or thick hair, and most parts of the human body hair have faded, what are the reasons for this? Next, I will analyze it for you.

1. Human migration.

Human civilization is a very wonderful thing is that I have traces of human existence in all corners of the world, many areas are very cold, but there are still many people living there, and some areas are very hot, and most of the people live in this kind of place, this is due to the frequent migration of human beings in the process of evolution, those who live in hot areas, will lose some body hair over time.

2. Human development.

With the evolution and development of human beings, human beings can gradually master a variety of tools, and even be able to manufacture a variety of complex products, such as cold clothing, when people feel cold, they will make a lot of cold and warm clothing, and even in hot areas, people will also make some clothing that covers important parts, so human beings will also lose a lot of useless body hair.

3. The wonder of nature.

Nature is a very wonderful system, flowers and plants in nature and all kinds of small animals are wonderful masterpieces of nature, human beings are also the products of nature, so people must be in awe of nature and respect nature at all times, only in this way can they better protect their habitat, people have not found that there are actually many things, at all times we must maintain the enthusiasm to explore, little by little to dig the wonders of nature.

Darwin's theory of evolution is about this phenomenon, in which the gradual change theory says that the pace of biological evolution is gradual, a gradual improvement process that accumulates small dominant variations under the action of natural selection.

At the time of our ancestors, there was no fire, and it was cold at night, in winter, and when it rained, we needed hair to protect ourselves, but now with the evolution of human beings, we have clothes, and we can make fires, and hair gradually becomes useless, so some people have sparse hair.

Natural selection of the fittest survives, and while human beings are changing nature, nature is also changing human beings.

Chimpanzees that have achieved genetic similarity to humans are covered with hair, as are other orangutans or apes, even if some of the hair is relatively sparse, but compared to humans, they are still covered in fur. In other animals, it is even more so, the rodents that achieve genetic similarity with humans are full of hair, like some other animals we are familiar with, such as tigers, lions, pigs, horses, cattle, sheep, dogs, etc., and such as hippos, elephants, rhinoceros, etc., such animals are because they need to be in contact with water for a long time, or live in water, so it is normal to take off their coats. So why do humans alone degenerate their wool coats?

Scholars believe that after human beings stand upright, the height increases, and the exposure to sunlight will be more, which will increase their own temperature, and at the same time, the human diet is diversified, and it is necessary to run fast to chase and hunt various wild animals, and fast running will cause the human body temperature to rise, and if there is still a lot of hair, it will seriously hinder the heat dissipation, which will cause the human body's hair coat to fall off. This explanation seems reasonable, but if we compare the giraffes, lions, cheetahs, deer, bison, zebras, and other animals that live in Africa, we can see that there are actually big loopholes. Some scholars believe that the cause of human hair degeneration is disease, hair will bring a variety of parasites, which can cause various diseases, evidence can be found in various animals with thick hair, such as fleas, lice, etc., parasites and bacteria in hair can lead to health problems, causing human evolution to lose the coat of hair.

Scholars have found that humans wore more and more clothes about 70,000 years ago, and although they did wear them before, they may have been simple coverings. During this time period, the earth happened to enter a Xiaoice period, so prehistoric humans wore clothes, but the warm environment was prone to parasites and bacteria, which caused humans to shed their coats to maintain their health. Therefore, in the case of diseases, the cause of human hair deterioration may be after putting on clothes.