New research shows that stress may actually be a cause of gray hair -- but also that in some cases, it can be reversed.
Before hairs emerge from the scalp, they grow under the skin in follicles that receive chemical and electrical signals, including stress hormones, from the body. Once they emerge, hairs harden, and their molecular structure is preserved and reflected in their pigment.
Researchers measured color loss in single strands of human hair from 14 volunteers who kept diaries to document their weekly levels of. The results were striking: As the volunteers had more stress, their hair lost pigment. But as the stress eased, their hair regained color, says Martin Picard, PhD, an associate professor of behavioral medicine at Columbia University Vagelos College of Physicians and Surgeons in New York City, who led the research.
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