雖然頭髮幾乎不可能一夜之間全變白,但很多因素會影響黑色素細胞的功能,減少黑色素的分泌,進而改變頭髮的顏色。壓力,可能就是其中的一個因素。
前文提到的這項研究,之所以受到關注,是因為這是科學家首次提供定量證據,將心理壓力與人們的頭髮變白聯繫起來。不過,需要說明的是,這項研究並不是大規模臨床試驗,只是一個對14人的小樣本做的小規模觀察試驗;並且,對於受試者“壓力”的評估是回顧性的,也就是受試者自己對所感受到的壓力進行主觀打分。因此,所得到的結果也只是為後續研究提供了方法上的探索,以及對於壓力和白髮相關性的觀察和推測,並不證明因果關係。
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