在发表于英国《自然》周刊上的一项研究中，纽约大学研究人员指出，被困住的黑素细胞干细胞无法合 成头发着色所需的蛋白质，这一机制或许可以解释白发的形成。 配音：王帅龙 编导：郭琳 新华社音视频部制作 0:00 《参考消息》2月10日刊发美国《大众机械》月刊网站报道《研究认为白发也许可以逆转》。 ...

Core Viewpoint - The article discusses the proliferation of products claiming to reverse gray hair, highlighting the skepticism surrounding their effectiveness and the underlying scientific principles. Group 1: Product Claims and Consumer Experiences - Various products marketed as capable of turning gray hair back to black are prevalent in online marketplaces, often featuring ingredients like He Shou Wu and black fungus, with claims of safety emphasized by sellers [1][3] - A consumer from Anhui reported spending over 300 yuan on a "white hair to black" product, but after multiple uses, she saw no noticeable change, leading her to feel deceived [5] - Experts assert that these products cannot truly reverse gray hair, as they primarily serve to provide nutrients rather than restore natural color [6][10] Group 2: Scientific Insights on Hair Color - The primary causes of gray hair are genetic factors and aging, with the decline of melanocyte function in hair follicles being the main reason for the loss of pigment [10][15] - Claims that certain products can penetrate hair roots and stimulate melanin production are largely unfounded, as current scientific understanding does not support the possibility of reversing gray hair once it has occurred [12][14] - Stress and nutritional deficiencies, such as a lack of vitamin D, have been shown to accelerate the graying process, indicating that lifestyle changes may be more effective than cosmetic products [15][17]

头发变白是衰老进程中不可避免的现象，一般来说，40岁后白发逐渐增多。然而有些人年纪轻轻就长了 白发，是早衰还是压力太大？又或是疾病原因？ 关于白头发，说法五花八门。《生命时报》综合多位专家观点，教你科学应对白头发。 有些白发有逆转的可能 陆军军医大学第一附属医院皮肤科教授杨希川表示，头发颜色是由毛囊中黑素细胞合成的黑色素颗粒来 决定的。黑色素颗粒越多，密度越大，头发就越黑，反之较浅。 影响黑色素合成的因素有很多：首先是年龄因素（40岁以后黑色素合成就会逐渐减少）。 此外，营养不良、精神压力大、睡眠不足、消化功能不好，也会影响黑色素的合成。有些"少白头"就是 因为后面这些原因导致的，但多数少白头还是与遗传关系更大。 华中科技大学同济医学院附属协和医院皮肤性病科主治医师杜虹瑶表示，目前，除了染发外，没有任何 可靠方法能让已经变白的头发自然转黑。不过以下4种情况，还可能有机会逆转： 压力过大 2020年，哥伦比亚大学的研究人员与迈阿密大学米勒医学院合作发现压力确实会导致头发变白，而消除 压力因素，可以让头发恢复到原来的颜色。 同时，研究人员强调，这种逆转似乎只适用于因压力而变白的头发，而且只在头发变白后不久才适用。 ...