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“少白头”的原因

Why Some People's Hair Turns Gray

看 那个性感的大叔
Look at that silver fox.
见多识广 卓尔不群
So distinguished, so sophisticated.
哇!
Wow!
但如果我说他是千禧世代的人 你会相信吗?
But what if I told you that this guy was a millennial?
这是真的 只是刚到39岁
It’s true, just barely.
Joe说 他16岁头发就开始变白
According to Joe, he started going gray when he was 16.
到22岁时 差不多就全白了
By 22, he was pretty much totally gray.
这是怎么回事呢?
Why does that happen?
为什么是头发先变白呢?
And why does hair turn gray in the first place?
如果你剖丝剥茧就会发现
There’s something about a silver fox,
这是性感大叔独特地方
if you can pull it off.
如果摆脱了白头发
When I got rid of my gray hair,
我想拥有正常的外形
I wanted a natural look.
但是很多人不喜欢头发变白
But many people hate the idea of going gray.
从而产生一个对抗白发的完整产业链
There’s an entire industrybuilt around fighting it.
你好像年轻了十岁
It’s like you took off 10 years.
就用五分钟
And in just five minutes.
男人专享
Just For Men.
她会爱上你的外貌
She’ll love the way you look.
那出现白头发的原因是什么?
So why does it happen?
头发随年龄增长从黑色变成白色或者灰色
The process of hair changing from darker color to white or gray
这主要与基因有关
with age is mainly due to genetics.
它遗传于父母的任何一方
It can be inherited from either parent.
而头发色素的构成
The color of our hair is determined by
会影响我们的发色
the form of hair pigment that we have.
实际上色素顺着发干产生
The pigment is actuallyproduced along the hair shaft,
而它主要有两种色素构成
and there are two mainforms of hair pigment.
真黑素与棕黑素
There’s eumelanin and pheomelanin.
真黑素常见于黑色和棕色发色人群
Eumelanin is what we see in brunettes and darker-haired people,
而棕黑素常见于金发与红发人群
and pheomelanin is what we see in blonds and redheads.
毛囊细胞会产生一点点过氧化氢
The cells in our hair bulb produce a little bit of hydrogen peroxide,
而过氧化氢是代谢产物
which is a metabolic byproduct,
通常有一种酶叫过氧化氢酶
and typically there’s an enzyme called catalase
它能把过氧化氢分解成水和氧气
that breaks this down to water and oxygen.
但随着年龄增长 酶的含量逐渐减少
But as we age, there’s declining levels of catalase,
这使毛囊里过氧化氢逐渐增多
and this allows the build-up of hydrogen peroxide
从而损害并消灭我们头发里黑色素细胞
in the hair bulb, which damages and destroys the melanocytes,
或产生色素的细胞
or the pigment producing cells, of our hair.
我希望你能看看我的同事Joe
So I wanted you to take a look at my colleague Joe here.
严格来说Joe是千禧一代的人
Joe is technically a millennial.
但他16岁时候头发就开始变白
He started to go gray when he was 16,
到22岁时 他的头发几乎全白了
and by 22, it was pretty much gray all over.
为什么Joe会发生这样的变化?
What happened to Joe?
在20岁之前头发变白
So when individuals gray early in life
就是所谓的少白头
before the age of 20, it’s called premature graying,
而这是由基因决定的
and this is due to genes.
我们知道有种能被定位的特殊基因
And we know there’s one gene in particular, that’s been targeted,
它就是干扰素调节因子-4
called interferon regulatory factor 4,
它的作用是产生和调控头发中黑色素含量
which is important regulating and producing melanin in the hair.
Joe足够幸运
Joe was lucky enough to
他遗传了少白头的基因
inherit some genes that predisposed him to developing gray hair early in life.
显然 这让Joe年纪轻轻就有白头发
Obviously, Joe has gray hair on his head.
而当你头发变白了
When you go gray on your head,
那身体其它部位毛发是什么颜色
does the hair on the other parts of your body
也变白了吗?
go gray as well?
不 不需要 Joe
No, no, Joe, Joe!
我们可以想象
We can picture it.
身体任何部位毛发也能变白
So you can grow gray hair anywhere on your body.
无论是哪的毛发 只要对氧化性损伤敏感的
Wherever you have hair, the hair is susceptible to oxidative damage
最后都会变白
and eventually going gray.
所以头发变白的主要原因是基因
So the main cause of going gray is genetics,
但压力对白发有影响吗?
but what role can stress play?
毕竟奥巴马刚上任时
After all, Obama didn’t look like this
头发并不像现在这么白
when he showed up at the White House.
压力引起白发的说法还是有争议的
So it’s controversial the role that stress has in hair graying.
众所周知 压力对身体造成氧化损伤
We know that stress creates oxidative damage in the body,
而它跟许多早衰症状的产生也有联系
and it’s been linked to a lot of premature-aging syndromes.
所以 人们认为压力会造成氧化性损伤
So it’s thought that the stress that stress causes oxidative damage,
而氧化性损伤会损伤黑色素细胞
which may cause damage to the melanocytes
从而导致我们出现少白头
and may cause us to grow gray earlier.
我们都知道吸烟的人比普通人
We know that smokers tend to go gray more so
更易长白头发
than the general population,
有人将这归咎于
and again it’s felt that it’s probably due to
吸烟对产生黑色素的细胞造成的氧化损伤
the oxidative damage that smoke causes and how it affects the pigment-producing cells in the hair.
我认为要饮食均衡
I think eating a well-balanced diet,
确保自己不会营养不良
so you make sure that you don’t develop any nutritional deficiencies,
这是能做到的事情
that’s another thing that can be done.
并且要调节压力
And modulating your stress,
这是另一件你可以控制的事情
that’s another thing you have control over
否则压力会导致氧化损伤
which over time can cause oxidative damage again,
进而让你长出更多白头发
make you prone to potentially more gray hair.

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视频概述

少白头的主要原因是基因;压力导致白发的说法存在争议;吸烟的人更容易长白头发

听录译者

收集自网络

翻译译者

Brittany

审核员

审核员BY

视频来源

https://www.youtube.com/watch?v=QJMTk8sBfFE

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