Source: WeChat official account of health and beauty
Original title: Embarrassing body odor atlas and countermeasures!
Author: HB
Sweat in the armpit, foot odor, aging odor, etc., the body "smell" troubles vary widely. In the pursuit of clean modern, people who are sensitive to smell are also increasing. We asked experts about the causes of various body odors and their countermeasures.
The countermeasures for the body odor that both you and others care about vary from path to path. "Many people think that sweat itself is smelly, but in fact, sweat is dry and has a little sour taste," said President Changming of Wuwei Clinic. However, if insufficient exercise and excessive use of air conditioners make sweating less likely, sweat glands will only use part of it, producing sticky sweat condensed by acetic acid and minerals. This thick sweat makes bacteria multiply on the surface of the skin, which is the cause of odor.
"Sweat components and sebum will give off a strong smell when they change according to the bacteria or ultraviolet rays on the skin surface. Aging odor and foot odor are just like this," said Professor Guan Genjiaxiang, a science discipline of Donghai University.
On the other hand, there is also the "body odor" of blood vessel components seeping from the skin. Professor Guan Geng said, "This smell is hard to remove even if you wipe it, and it is easy to become heavier due to age, fatigue, stress or disease."
Many people believe that "aging odor" is a peculiar odor of middle-aged and elderly men, but in fact, women also emit aging odor. "The reason for aging is that palmitoleic acid on the skin surface forms 2-nonenal after lipid oxidation," Professor Guan said. This substance will increase in both men and women after the age of 40.
There are two reasons. "One is that the antioxidant capacity decreases with age. Female hormones have antioxidant effects. With age, the antioxidant capacity of the whole body will decline when the amount of hormones decreases." President Wu Wei said. Another reason is the increase of palmitoleic acid in sebum. "Generally, the amount of sebum secretion will decrease with age, but on the other hand, the proportion of palmitoleic acid in sebum will increase." (Professor Guan Gen).
Aging odor is easily produced in the armpit or back, chest, back of neck, scalp and other places where fat glands are concentrated. "The smell of the head is a mixture of the 'scalp odor' formed by sebum and the reproduction of miscellaneous bacteria on the scalp and the 'hair odor' of damaged or semi dry hair that absorbs the surrounding odor. But washing too much will increase sebum, which will be counterproductive. You can only wash your hair once a day, and then dry it well after washing," said President Wu Wei.
On the other hand, the peculiar fat odor "fat odor" of men in their 30s to 40s is caused by the oxidation of sebum and the diacetyl group produced by bacteria on the skin surface, which often decomposes lactic acid in sweat. In the 30 year olds with strong sebum secretion, they began to care about smell. "Since lactic acid is easy to increase under the condition of low oxygen, the oil odor will be aggravated under the suffocating pressure." (President Wuwei).
The unpleasant smell generated on such skin surface can be cleaned or wiped with detergent, which can be removed to a certain extent. "Showering in the morning can remove the odor generated during sleep and reduce the unpleasant odor generated during the day," said Professor Guan.
In addition, "intake of polyphenols rich in catechins or isoflavones, vitamin C E and other antioxidant ingredients are also the countermeasures for aging odors. " (President Wu Wei). In fact, it has been proved that one of the polyphenols, black currants rich in anthocyanins, can reduce aging odor.
Countermeasures: The key point is to use according to the different parts and types of odor.
From scalp to foot, a variety of countermeasures against "body odor" are mainly added with antibacterial ingredients that inhibit the activity of bacteria on the skin surface, antioxidant ingredients that prevent sweat or sebum oxidation, and deodorant ingredients that absorb and decompose odor substances.
To put it simply, "antibacterial" is to prevent the breeding of mixed bacteria, which is the root of bad smell. It is to sterilize fungi that cause odor in sensitive areas and oral bacteria that produce antibacterial halitosis. Because the types of bacteria that cause odor in different parts are different, it is important to choose special items to have an effect.
On the other hand, in the countermeasures against "body odor", in addition to the deodorization spray specifically for pressure odor, there are also drinks that can emit "fragrance" from the body for use.
In the detergent for removing excess sebum, add antioxidant or antibacterial ingredients to prevent oxidation, which can block the odor caused by aging. Iron is also concerned as a cleaning agent to prevent the smell of clothes.
Although it is difficult to remove the odor emitted from the body, there are also counter products in antiperspirants.
The rose fragrance is the same as the fatigue odor. It is a soft fragrance emitted from the body?!
"The smell emitted from the body is not just an unpleasant smell. In fact, some studies have shown that the fragrance of roses can also seep out from the skin" (Professor Guan Gen).
The unique sweet smell of girls in junior high school is the taste of "lactones" also contained in fruits
Young people exude a unique "sweet fragrance". Its original form is a "lactone" containing aroma components such as peach or coconut. "No matter men or women, many lactones are detected in young people, which decreases after the age of 20. This may be because lactones are oxidized to other substances with age," said President Wu Wei. Professor Guan Geng's research shows that lactones will increase due to the increase of lactose intake.
50 women over 10 to 50 years old were selected as the subjects, and they wore clothes for about 24 hours C11) These five odors were evaluated with the 6-stage odor intensity representation method. The results showed that the sweetness of lactones was strong between 10 and 20 years old, and would decrease significantly after 30 years old. (Data: released by ROHTO Pharmaceuticals at the "51st Conference of Japanese Taste and Odor Society" held in Kobe in September 2017)
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