Why is it that men grow beards when they grow up, but they don t when they are young?

Post-pubertal males generally grow beards. Beards grow faster than hair, which is the result of the action of male hormones. The more vigorous the reproductive function, the faster the beard will grow.

The blood vessels in the beard area are more distributed than the hair roots, and nutrients are easy to obtain, so if you just shave off your beard, it will grow again in a few days.

Recently, foreign experts have found that beards have the property of adsorbing harmful substances. When people breathe, they can discharge a variety of harmful chemical gases, and they can all stay on the beard; The atmosphere contains a variety of heavy metal particles, especially in busy streets, polycyclic aromatic hydrocarbons and lead emitted from automobile exhaust will also be adsorbed by whiskers; Smokers, carcinogens such as benzopyrene in smoke, can also stay on their beards. In addition, the epidermis of a long beard secretes more oil, which is often difficult to remove when washing the face with water.

Studies have shown that greases have the property of adhesion to dust and microorganisms.

Foreign experts analyzed the shaved beard by gas chromatographs and found dozens of harmful substances, such as carbon dioxide, nitrogen oxides, benzopyrene and lead and other heavy metal elements. Under the microscope, a large number of microorganisms can also be seen on the beard. These harmful substances may be sucked back into the respiratory tract with the action of human respiration, endangering human health.

Therefore, people are advised not to grow beards.

This is a secondary sex characteristic.

Indicates the onset of puberty

The faster the beard grows, the faster the beard grows, and vice versa. There is no necessary relationship between shaving and growing beard, but the frequency of shaving can often reflect a man's male hormone secretion status. In mature normal males, the rate of beard growth is millimeters per day.

The lifespan of each beard is about 1-3 years, and the growth of each beard is fast and then slow, first thin and then thicker. Of course, both lifespan and growth rate vary from person to person, so the length of each person's beard will be very different if you grow hair. The boy's beard grows faster and faster, and I think it's an illusion for two main reasons:

1. In the development period, the growth rate of the beard is accelerating, and you shave it and don't shave it, and it feels like a cause and effect.

2. Referring to the illusion, if the beard is one centimeter long and grows millimeters every day, there will be no obvious feeling; If you scrape off the karyotype, it will be long in one day, and it will be 1 mm in two days, and it will feel obvious. In addition, the thicker it becomes the more it is scraped, which is also due to the thin tips and thick roots, plus the first reason above. The characteristics of each person's beard, such as length, straightness, thickness, distribution shape, etc., are mainly determined by congenital genetic factors.

First of all, no matter which man grows a beard when he gets old, there is no such thing as a man who doesn't grow a beard!

The reason why someone asked this question is because he has not seen the beard of the person's parents, and he concludes that the other person does not grow a beard, which shows that some people lack physiological knowledge and are narrow-minded.

It should be emphasized repeatedly that beards are the product of men's aging, there is no such thing as a man who does not grow a beard, men will grow beards when they get old, and the older they get, the more beards they have!

As for at what age a man begins to grow a beard, the speed of beard growth, the number of beards, the thickness of the beard, and the coverage, all of which are determined by genetic inheritance, and each person varies greatly.

Some people grow beards as soon as they develop, some people begin to appear in their 40s, and Han men basically start to grow beards in their 30s.

People are genetically inherited from his early 40s and only started to grow beards, do you think it's ridiculous to point to him in his 20s and say that he doesn't grow beards?

The growth of a man's beard has nothing to do with the level of male hormones, unless there is no at all. Increasing male hormones in men does not promote beard growth, but affects beard growth by two factors: genetic inheritance and age (increase).

The thickness of the beard is mainly related to the hair follicles, so whether a man will grow a beard is also related to the hair follicles, and the hair follicles are different for each person.

Reasons why men don't grow beards: 1. It is related to genetic factors.

2. One of the reasons is the lack of male hormones. 3. Before reaching the age, boys develop relatively late, and as a major feature of male sexual maturity, the beard naturally comes out later. 4. You may have inadvertently eaten too much food containing estrogen.

There are generally two reasons why men do not grow beards, the first is that the secretion of male hormones is abnormal, in addition to not growing a beard, there will also be no Adam's apple and other phenomena, this situation may be born, or it may be pathological, if it is the latter reason, you need to go to the hospital to find out the situation, in time. The second reason for not growing a beard is the most common, many men are born with a lack of hair follicles in the beard area, or the function of the hair follicles has atrophied, in this case, even if the male hormones and other body functions are normal, it will still lead to no beard.

Ethnicity, cold temperate hairy, tropical beardless, such as Liangguang, Fujian, Hainan, the Philippines, Singapore, Vietnam, Thailand, a large proportion of men in these places do not grow beards.

Men will not only grow beards, but also grow Adam's apple, which is a sign of male maturity, and it is also a male hormone secreted by men after maturity, male hormones cause men to grow beards and Adam's apples, and women will secrete a female hormone after maturity, but there are also women who grow beards, indicating that this kind of woman's body is slightly higher than the male hormone contained in a normal woman's body, which is also a normal phenomenon.

Why do boys grow beards? This is closely related to the metabolism of sex hormones in the human body. In general, healthy men after puberty grow beards that are initially soft and thin, and gradually become coarse and dense over time.

Modern medicine has found that at this time, men secrete more male hormones in their bodies, making their hair black and thick, and the production of beards is a typical manifestation.

This is the result of androgen dominance in the male body. Many of the differences between men and women in physical appearance and even personality are affected by sex hormones, the difference is that androgens dominate in men's bodies, and estrogen dominates women's bodies.

That's a good question.

Let's put it simply.

Because the beard is more expensive, only the thin skin of a boy, so he has a beard

Because you secrete too many hormones, you know when you grow up, and more melanin comes out.

Is there a problem? If so, go directly to the genital network to learn about it.