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If you’re worried about going grey – try to relax.Scientists have found too much stress really does turn our hair white. 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。 Researchers discovered the cells that give hair its colour disappear when the body is exposed to stress hormones. And unfortunately for those affected, these ‘colourful’ cells are unlikely to return, leaving the hair grey for good. 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。 US scientists carried out experiments on mice which showed the startling effect that stress has on our hair. They began with the premise thatwhen the human body is injured, stem cells responsible for producing melanin – the dark pigment that protects us from sunlight – move from hair follicles to the skin, to help limit the damage. In their tests on mice, the same permanent draining of colour occurred when the animals were exposed to stress hormones. 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。 | 
