Humans Are Still Evolving Right Before Our Eyes on the Tibetan Plateau

A study of 417 women living their entire lives above 3,500 meters in Nepal found blood traits linked to better oxygen delivery.

Women with the most live births had average hemoglobin levels but higher hemoglobin oxygen saturation, helping avoid overly thick blood.

Researchers say these traits support survival and reproduction in low-oxygen conditions, showing ongoing human adaptation to high altitude.

The findings add evidence that natural selection is still shaping how people cope with extreme environments like the Tibetan Plateau.