Health
Red hair may be increasing as study points to surprising evolution trend
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A study from Harvard Medical School indicates natural selection has favored the red hair gene, resulting in a potential increase in the number of redheaded people as humanity continues to evolve.
By analyzing nearly 16,000 ancient genomes spanning 10,000 years, researchers identified a list of traits that nature is actively pushing forward. Among the most prominent were the genetic variants for red hair.
“Perhaps having red hair was beneficial 4,000 years ago, or perhaps it came along for the ride with a more important trait,” the authors noted.
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The study, published in the journal Nature, relied on a large database of ancient DNA from West Eurasia. Using new computing methods, the team was able to filter out random fluctuations in DNA to identify what it called “directional selection.”
Directional selection happens when a particular version of a gene gives an organism a strong survival or reproductive advantage, causing it to become more common in a population faster than it would by chance, according to experts.
Directional selection is when a specific gene provides such significant benefits that it rises in frequency across a population much faster than random chance. (iStock)
Prior to this study, scientists only knew of about 21 such instances in human history, one of which was lactose tolerance. This new research uncovered hundreds more.
“With these new techniques and a large amount of ancient genomic data, we can now watch how selection shaped biology in real time,” Ali Akbari, first author of the study and senior staff scientist in the lab of Harvard geneticist David Reich, said in a press release.
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The data showed that genetic markers for red hair are among 479 gene variants that have been strongly favored over the past 10,000 years. One likely explanation, the researchers said, is a major shift in human history: the transition to farming.
Scientists have long pointed to vitamin D synthesis as a likely driver for the rise of traits like fair skin and light hair. (iStock)
As humans moved away from hunting and gathering and settled into agricultural societies, their environment and behavior changed radically, triggering an evolutionary “acceleration.”
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While the Harvard study provides the first definitive statistical proof that red hair was actively selected during the rise of farming, the researchers noted that the exact prehistoric benefit still requires more study.
However, scientists have long pointed to vitamin D synthesis as a likely driver for the rise of these light-pigmented traits in northern climates.
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While redheads remain a minority of the global population today, the Harvard study’s analysis suggests that they may not be an evolutionary accident.
While redheads remain a minority of the global population today, the Harvard study’s analysis suggests they may not be an evolutionary accident. (iStock)
Instead, the red hair trait was “boosted” by natural selection as humans adapted to the challenges of a modern world, according to the researchers.
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The researchers urged caution in how these findings are interpreted.
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“What a variant is associated with now is not necessarily why an allele propagated,” the authors noted.
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Yoga is known to boost relaxation, strength and flexibility – and now a new study has found the practice could improve cancer survivors’ quality of life.
A randomized trial led by the University of Rochester Medical Center found that a four-week yoga program significantly reduced insomnia, fatigue, anxiety and mood disturbances after cancer treatment.
The findings were presented last week at the 2026 American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago.
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The study was conducted across multiple U.S. community cancer care sites, including 410 adult cancer survivors averaging 54 years of age. Around 75% were breast cancer survivors, and none of them had practiced yoga regularly within the prior three months.
A randomized trial led by the University of Rochester Medical Center found that a four-week yoga program significantly reduced insomnia, fatigue, anxiety and mood disturbances in cancer survivors. (iStock)
The participants were randomly assigned to two groups. Half of them received only standard survivorship care without the yoga, while the other half received standard care and were also enrolled in the Yoga for Cancer Survivors (YOCAS) program.
As part of the YOCAS program, the survivors completed two instructor-led 75-minute yoga sessions each week, including 18 Gentle Hatha yoga and Restorative yoga poses, breathing exercises and mindfulness training.
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Based on questionnaires completed by the patients, the survivors in the yoga group experienced “moderate-to-large” reductions in overall mood disturbance, “small-to-medium” reductions in anxiety and “medium-to-large” reductions in fatigue, the study found.
The improvements in mood and fatigue appeared to be linked to yoga’s beneficial effect on sleep quality, according to the researchers.
As part of the YOCAS program, the survivors completed two instructor-led 75-minute yoga sessions each week, including 18 Gentle Hatha yoga and Restorative yoga poses, breathing exercises and mindfulness training. (iStock)
“This indicates that cancer survivors have an option to alleviate these cancer-related side effects at the same time, without adding another drug,” lead investigator Yuri Choi, PhD, of the Wilmot Cancer Institute, University of Rochester Medical Center, in Rochester, New York, told Fox News Digital.
The study did not reveal any major safety concerns or serious adverse events related to the yoga practice.
“This indicates that cancer survivors have an option to alleviate these cancer-related side effects at the same time, without adding another drug.”
The study did have some limitations, chiefly that the findings are preliminary and have not yet been peer-reviewed for a medical publication.
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“The sample in our clinical trial was relatively homogeneous, with most participants being women (96%), breast cancer patients (75%), Caucasian (93%), and having some college or higher education (82%),” noted Choi.
“We are adapting our intervention to reach all cancer patients and survivors, including the creation of a mobile app to reach people in rural communities.”
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The research also excluded patients with metastatic cancer (whose disease had spread to other parts of the body).
The total study was only four weeks, so more research is needed to determine long-term benefits.
If the findings are confirmed by peer-reviewed publications, this could lead to recommendations for structured yoga programs as a non-drug supportive therapy for cancer survivors, the researchers noted. (iStock)
If the findings are confirmed by peer-reviewed publications, this could lead to recommendations for structured yoga programs as a non-drug supportive therapy for cancer survivors, the researchers noted.
Some yoga studios may use different names for Gentle Hatha and Restorative yoga, such as Foundations Yoga or Healing Yoga, Choi noted.
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“Survivors should also look for certified yoga instructors who have experience working with cancer patients/survivors or individuals with other challenging health conditions,” the researcher advised. “They should not be afraid to ask their oncology team for referrals to qualified instructors in their community.”
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Choi also noted that the research did not reveal whether other types of yoga, such as heated-room or rigorous-flow yoga, are safe or beneficial for cancer survivors.
The study was funded by the National Cancer Institute.
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