By Franklin Delgado
A recent study from Harvard Medical School reveals that pure selection has favored the red hair gene, suggesting a possible increase in the number of redheads as humanity evolves.
This analysis was based on nearly 16,000 ancient genomes, showing that certain traits, such as red hair, have been favored over 10,000 years. “Perhaps having red hair was beneficial 4,000 years ago, or perhaps it emerged along with a more important characteristic,” the authors noted.
The study, published in the journal Natureused a vast array of ancient DNA data from Western Eurasia. Using new computational methods, the researchers identified “directional selection,” where a gene provides significant advantages in survival and reproduction, prevailing more quickly in the population than by chance.
Implications of the agricultural transition
The researchers suggest that the increase in selection for red hair could be linked to the transition from hunting and gathering to agriculture.
This radical change in the human way of life could trigger an “evolutionary acceleration,” causing selection for traits such as light skin and light hair, possibly driven by vitamin D synthesis.
Specific advantages of red hair in the past
In the past, red hair (along with light skin) may have offered advantages primarily in regions with little sunlight, linked to biological adaptation rather than aesthetic appearance.
Better vitamin D production
- Red hair usually appears with very light skin and little melanin, which allows ultraviolet radiation to penetrate the skin more easily. This promotes more efficient synthesis of vitamin D, especially in northern climates with short days and little sunlight.
- In ancient societies where the diet provided little vitamin D (fatty fish, eggs, etc.), this advantage would have reduced the risk of rickets and other bone problems, improving survival and fertility.
Relative pain resistance
- Several studies link the MC1R gene (responsible for red hair) with a higher pain threshold in some people, especially women.
- In premodern contexts, with childbirth, injuries, and intense physical labor, greater pain tolerance could have increased the chances of surviving traumatic episodes or medical complications.
A future for redheads
Although redheads currently constitute a minority in the world’s population, the study’s findings indicate that their presence is not an evolutionary accident.
Instead, their trait was “boosted” by pure selection in response to the challenges of the modern world.
However, the study’s authors caution that more research is required to understand the exact prehistoric benefits associated with red hair.
You may also be interested in:
· Many types of medications cause hair loss.
· Be careful when you lie! The voice does not constantly deceive
· If your child lives locked in his room, playing at night and sleeping during the day, he may be suffering from Hikikomori syndrome.
