After the beginning of summer
The sun is opening up Frequent
hot temperatures
reduce wearing fabrics Humans
not only bring a limited summer visual feast
And that rich flavor
Speaking of body odor
Many people think of the smell of sweat
but sweat is innocent
it is colorless and odorless
< /p>
The secret to a true synthetic scent is this
Sweat gland secretions + skin microbiota and its products
Sweat glands on human skin
about 3 million
when sweating span>
< p>It will add some “materials” to the liquid
such as salt, protein, urea, fat, semiochemical, etc.
< p>These things just happen to be
the “natural dining hall” of the skin microbiome< /p>
and during microbial digestion
produces a lot of biogenic amines and short-chain fatty acids
the main source of odor
span>
Interestingly
the smell-secreting bacteria The colony is also related to gender
male secretion flora is mainly Corynebacterium
Girls are mostly Micrococcus
So men’s sweat is more spicy and women’s more sour
In addition
genes in vivo also determine
Can one become a “body odor transmitter”
Gene mutations make some people
Free from body odor
Take body odor as Example
A long time ago
Almost every human ancestor had a “body odor”
/p>
The ABCC11 gene in human chromosome 16
mutated
< span>results in decreased secretion of apocrine glands
this directly reduces the living conditions of the microflora
therefore The odor is naturally reduced a lot
strong >But this variant is more common in Asians
so compared to other ethnic groups
Asian people have relatively mild body odor
only a small number of people have body odor problems
< span>
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But the following gene variant
Much more painful
There is a type of person who is born with the smell of rancid fish
Medically known as Smelly Fish Syndrome
(Smelly Fish Syndrome or Trimethylaminuria)< /span>
Trimethylamine (TMA) is an amine
It will emit fish odor
Common in egg yolks, beans and saltwater fish substances
and patients with stinky fish disease
Congenitally deficient in genes that metabolize TMA
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>
Many people think that
the “origin” of body odor comes from The upper body
but the power of the lower body to produce odor should not be underestimated
wet, closed Ventilation
is the best reason for the aerobic bacteria community on the private parts of the feet
But some private parts have odor or abnormality
actually reflect some diseases< /p>
For example, the smell of female private parts
with abnormal vaginal discharge and burning sensation
may be STD infection or vaginal inflammation
and male private parts odor inflammation< /p>
It is possible that the foreskin is too long and the cleaning is not in place
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The biggest difference between today’s feet and the past
is in the shoes
Old ancestors love to wear animal leather shoes
Loose and breathable
span>
Therefore less pain of foot odor
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References:
【1】Jin Lijun. The essence of body odor [J]. Family Medicine, 2021(7):6-7.
[2] Wang Quanqing. What to do about abnormal leucorrhea [J]. Family Life Guide, 2019(9 ):153.
[3] “The Secret of the Human Body” [De] Yale Adler, [ De] Katja Spitzer. Beijing Science and Technology Press. 2020-11
[4] Xia Fan, Cai Yunqi. What to do about body odor in summer [J]. Health Life, 2021(14):26-27.
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