What causes men to grow beards?

It is normal for men to grow beards, especially after entering puberty. The male hormones and hormone effects make the reproductive function more vigorous, so the beard will naturally grow faster. In order to maintain a fresh image, of course, you have to shave regularly.

1. Function

The theory of evolution does not talk about the elimination of useless features, but the elimination of features that are not conducive to the survival of individuals and leaving offspring. This elimination of features is achieved through the death of individuals who retain these features (before they leave offspring).

The evolutionary theory of beards may be that beards are a product of male hormones, and this feature can be used to identify the maturity and sex hormone levels of an individual, which may have played a role in ancient humans choosing mates. So it is not completely useless.

2. Reasons

Men generally grow beards after puberty. Beards grow faster than hair, which is the result of the action of male hormones. The stronger the reproductive function, the faster the beard grows. The blood vessels in the beard area are more than the roots of hair, and nutrients are easier to obtain. Therefore, the beard will grow again in a few days after shaving.

3. Recently , foreign experts have found that beards have the property of absorbing harmful substances. When people breathe, they can emit a variety of harmful chemical gases, which can all be retained on the beard; the atmosphere contains a variety of heavy metal particles, especially in busy streets, polycyclic aromatic hydrocarbons and lead emitted by car exhaust will also be absorbed by the beard; for smokers, carcinogens such as benzopyrene in the smoke will also stay on the beard. In addition, the epidermis of people with beards secretes more oil, which is often difficult to wash off when washing the face with water. Studies have shown that oil has the property of adhering to dust and microorganisms.