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動画の字幕をクリックしてすぐ単語の意味を調べられます!
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TRACE: I'm perspiring like a pig!
Do people even say that anymore?
JACKIE: *gagging* No.
No they do not.
TRACE: Salty.
JACKIE: So gross.
TRACE: Hey there sweaters, Trace and Jackie here
for DNews!
Welcome Jackie!
JACKIE: Thanks!
Deodorant, the bane of the absent-minded person's existence.
How many times have you left the house and forgotten to put on deodorant?
All good?
Gross.
The antiperspirant-deodorant market topped 18 billion dollars last year.
That's a lot of pits.
Including yours.
But do you really know what you're slathering on your skin?
TRACE: The first deodorant was patented in 1888
with a goal to help uptight Victorians stop worrying about their body odor.
But the odor wasn't really their fault.
It was BACTERIA!.
Lemme back up though.
On your skin, you have between two and five million sweat glands; they come in two flavors:
eccrine and apocrine.
Sweat is mostly water, but not entirely.
JACKIE: The eccrine glands excrete primarily H2O, but the apocrine glands (located on your scalp,
in your crotch, and under your arms) put out a thicker fluid with fatty acids, urea and
ammonia (protein byproducts).
TRACE: Once the sweat is on your skin, bacteria go
to town on it, chomping and eating up all those proteins (on the skin) and pooping out stinky chemicals
like trans-3-methyl-2-hexenoic acid -- which is the main chemical that makes humans stink.
Most animal funk is used to tell other animals different things.
For example dogs can be trained to smell low blood sugar in diabetics, people can tell
what you've eaten by your sweat, and chemosignals can reveal emotions, like if you're stressed,
or happy.
JACKIE: But, at some point, we decided we wanted to
cover up the sweaty informational smell.
Even before deodorants as we know them, people would perfume or cologne up to cover their
distinctive odor!
TRACE: The first deodorant, called Mum, is from the
late 19th century and it allegedly used zinc oxide -- a byproduct of zinc smelting to
control bacterial growth.
Fewer bacteria, less smell.
JACKIE: Antiperspirants were also invented in the
early 1900s and used alcohol and aluminum chloride.
(When applying the deodorant onto the skin) the alcohol would evaporate leaving behind Al-Cl-3, which, according to the American
Chemical Society, would stop up those eccrine glands, cutting sweat production.
TRACE: But remember, it's the apocrine glands that
excrete the stinky, bacteria-buffet.
Which is why most products combine antiperspirant and deodorant.
JACKIE: They plug the eccrine and keep the bacteria
off the apocrine!
But, like anything, there are consequences for messing with bacteria in our underarms.
TRACE: Deodorants and antiperspirants control bacterial
populations.
Some contain the now-enemy-of-the-FDA: triclosan; an antibacterial agent that's helping cause
the rise of superbugs.
JACKIE: Others contain preservatives called parabens,
which, if they get into your bloodstream through razor nicks (or other open cuts), have possible
estrogen-like properties, and are connected to breast cancer tumors.
TRACE: All-natural deodorants cover the little buggers
with essential oils, salts, or alum, but whether they work depends more on the person, and
their situation.
JACKIE: But, before you say, YOU FORGOT.
No.
Antiperspirants themselves do not cause breast cancer.
No.
Nope.
No.
No.
TRACE: A study of nearly 1600 people in the Journal
of the National Cancer Institute, found no evidence whatsoever of antiperspirant or deodorant
increasing the risk of breast cancer.
JACKIE: What they can do is alter your microbiome
-- the bacteria that live on us all, sometimes helping us live healthier lives.
A study in PeerJ looked at the microbiome of a small number of people who used deodorants
and antiperspirants, and found people who used antiperspirants were altering their armpit
microbiome!
TRACE: Once people stopped using antiperspirant or
deodorant, the number of staphylococcal bacteria skyrocketed!
JACKIE: … In comparison to those who didn't use
any Anti-Ps or Dee-odes... I'm still working on that.
TRACE: I don't know what to think about that.
What does that mean?
No idea!
The study was ridiculously tiny, but it does show daily hygiene can mess with bacteria
in unknown ways.
JACKIE: The researchers said, quote "We have no idea
what effect, if any, this has on our skin and on our health.
Is it beneficial?
Is it detrimental?
We really don’t know at this point."
As you all like to say, more research is needed.
The thing is, you don't actually need deodorant.
Some people don't produce the chemical that bacteria eats to make smelly by-products!
And you'd never know if you're one of those people, unless you stop deodorizing.
TRACE: Or if you have dry earwax.
JACKIE: What?
TRACE: Of the two percent of the human population
who don't have the gene for stinkiness, that same gene gives people "wet" earwax.
If you have dry, flaky earwax, you probably don't need deodorant.
JACKIE: I have to go find a cotton swab...
Look, everyone wants to smell awesome, but
what about pheromones…
These incredible chemicals allegedly tell people all about you… through the power
of smell.
This is assuming humans can sense pheromones at all...
Have I incited enough excitement and doubt?
Click here to watch the video explaining it all.
TRACE: Are you one of those two percent that don't need deodorant?
JACKIE: Or do you just think you are?
Have you asked your best friend?
Let us know down in the comments, make sure you subscribe
for more DNews and thanks for watching
Also, tell us your thoughts over on Twitter
or Facebook I'm @jackiekoppell and he's @tracedominguez .
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

読み込み中…

夏の味方、制汗剤!体にどんな影響を及ぼすの? (What Is Deodorant Really Doing To Your Body?)

24198 タグ追加 保存
韓澐 2017 年 6 月 18 日 に公開    Tomomi Shima 翻訳    VoiceTube Japan チェック
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