The five: factors that affect early greying

As researchers confirm that stress can turn you grey, we look at the other scientific factors that could salt-and-pepper your crowning glory

This week, scientists from Harvard demonstrated that stress can accelerate the greying of human hair. The researchers found that stress prompts the production of a hormone that affects the melanocyte cells involved in making hair pigments. The scientists hope that this discovery will add to the understanding of how the depletion of stem cells contributes to ageing in general.

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