The researchers said this could explain why stress can also cause pigmentation which makes the skin appear darker. Most of us spot our first grey hairs around the age of 25, and everything from genes to alcohol and smoking have been blamed for kicking off the process. There are tales of people going grey overnight after bereavement or shock.

研究人员说，这可能会解释为什么压力也会导致色素沉着使皮肤显得更黑。我们大部分人大约在25岁会初次看到有了灰色头发，有多种因素导致我们出现白发，基因、吸烟、喝酒、压力等因素都会使头发变白。经历大的变故的人或经历丧亲之痛休克后，一夜之间头发就会变得灰白。

Dr Mayumi Ito from New York University, who led the latest study, said there was evidence that stress could make melanin ‘migrate’ away from the hair follicle to the skin.‘We thought it would be interesting to speculate that excessive stress might promote this migration too much,’ he said. The study, which was published in the journal Nature Medicine, concludes: ‘Stress hormones are known to promote skin pigmentation, yet paradoxically and anecdotally, they are believed to promote hair greying.‘Our results may provide insight into the relationship between stress hormones and hair greying.’

纽约大学麻由美-伊藤博士领导了这项最新研究，指出有证据表明压力会使毛囊中的黑色素‘沉淀’到皮肤上。我们原本认为压力过大黑色素沉淀过多这个说法是个很有意思的推测而已，’他说。该项研究发表在《自然医学》杂志上，报告总结：‘已知压力荷尔蒙促使皮肤色素沉淀，但却反而认为促使头发变得灰白。’‘我们的研究结果可以为压力荷尔蒙和头发灰白之间的这一关系提供洞察依据。’

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