工作狂要小心：压力太大会导致一夜白头！
<p><span word="If">If</span> <span word="you">you</span>’<span word="re">re</span> <span word="worried">worried</span> <span word="about">about</span> <span word="going">going</span> <span word="grey">grey</span> – <span word="try">try</span> <span word="to">to</span> <span word="relax">relax</span>.<span word="Scientists">Scientists</span> <span word="have">have</span> <span word="found">found</span> <span word="too">too</span> <span word="much">much</span> <span word="stress">stress</span> <span word="really">really</span> <span word="does">does</span> <span word="turn">turn</span> <span word="our">our</span> <span word="hair">hair</span> <span word="white">white</span>.</p><p>如果你担心头发灰白——试着让自己放松。科学家们发现压力太大真的会让头发变白。</p><p><span word="Researchers">Researchers</span> <span word="discovered">discovered</span> <span word="the">the</span> <span word="cells">cells</span> <span word="that">that</span> <span word="give">give</span> <span word="hair">hair</span> <span word="its">its</span> <span word="colour">colour</span> <span word="disappear">disappear</span> <span word="when">when</span> <span word="the">the</span> <span word="body">body</span> <span word="is">is</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="stress">stress</span> <span word="hormones">hormones</span>. <span word="And">And</span> <span word="unfortunately">unfortunately</span> <span word="for">for</span> <span word="those">those</span> <span word="affected">affected</span>, <span word="these">these</span> ‘<span word="colourful">colourful</span>’ <span word="cells">cells</span> <span word="are">are</span> <span word="unlikely">unlikely</span> <span word="to">to</span> <span word="return">return</span>, <span word="leaving">leaving</span> <span word="the">the</span> <span word="hair">hair</span> <span word="grey">grey</span> <span word="for">for</span> <span word="good">good</span>.</p><p>研究人员发现当身体处于压力荷尔蒙环境下，那些使头发着色的细胞就会消失。不幸的是，如果‘着色’细胞受到影响后就不可能再新陈代谢、恢复到从前的状态，所以头发就会永远变成灰白色的了。</p><p><span word="US">US</span> <span word="scientists">scientists</span> <span word="carried">carried</span> <span word="out">out</span> <span word="experiments">experiments</span> <span word="on">on</span> <span word="mice">mice</span> <span word="which">which</span> <span word="showed">showed</span> <span word="the">the</span> <span word="startling">startling</span> <span word="effect">effect</span> <span word="that">that</span> <span word="stress">stress</span> <span word="has">has</span> <span word="on">on</span> <span word="our">our</span> <span word="hair">hair</span>. <span word="They">They</span> <span word="began">began</span> <span word="with">with</span> <span word="the">the</span> <span word="premise">premise</span> <span word="that">that</span><span word="when">when</span> <span word="the">the</span> <span word="human">human</span> <span word="body">body</span> <span word="is">is</span> <span word="injured">injured</span>, <span word="stem">stem</span> <span word="cells">cells</span> <span word="responsible">responsible</span> <span word="for">for</span> <span word="producing">producing</span> <span word="melanin">melanin</span> – <span word="the">the</span> <span word="dark">dark</span> <span word="pigment">pigment</span> <span word="that">that</span> <span word="protects">protects</span> <span word="us">us</span> <span word="from">from</span> <span word="sunlight">sunlight</span> – <span word="move">move</span> <span word="from">from</span> <span word="hair">hair</span> <span word="follicles">follicles</span> <span word="to">to</span> <span word="the">the</span> <span word="skin">skin</span>, <span word="to">to</span> <span word="help">help</span> <span word="limit">limit</span> <span word="the">the</span> <span word="damage">damage</span>. <span word="In">In</span> <span word="their">their</span> <span word="tests">tests</span> <span word="on">on</span> <span word="mice">mice</span>, <span word="the">the</span> <span word="same">same</span> <span word="permanent">permanent</span> <span word="draining">draining</span> <span word="of">of</span> <span word="colour">colour</span> <span word="occurred">occurred</span> <span word="when">when</span> <span word="the">the</span> <span word="animals">animals</span> <span word="were">were</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="stress">stress</span> <span word="hormones">hormones</span>.</p><p>美国科学家在老鼠身上做了实验，结果显示压力对我们的头发的影响效果是惊人的。研究人员首先假设人体处于阳光暴晒的环境下，身体干细胞负责生产黑色素，在阳光紫外线的照射下，黑色素会对我们有保护作用，毛囊中的黑色素沉淀到皮肤上，会起到减少皮肤伤害的作用。在他们对小白鼠做的实验中，当小白鼠处于压力荷尔蒙条件下，同样出现永久褪色的状态。</p>
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