<div>A new study has revealed that Tibetan communities have developed unique adaptations to survive in the low-oxygen conditions of the Tibetan Plateau, providing a striking example of ongoing human evolution.</div>
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<div>For the past 10,000 years, populations in this region have thrived despite the thin air, which would typically cause hypoxia&mdash;a condition where the body struggles to obtain enough oxygen. While most people experience altitude sickness at such elevations, Tibetans have naturally adapted to these extreme conditions.</div>
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<div>The research, led by Cynthia Beall, University Professor Emerita at Case Western Reserve University, sheds light on the physiological advantages Tibetan women possess, enabling them to reproduce successfully in an oxygen-poor environment. Published in the Proceedings of the National Academy of Sciences (PNAS), the research highlights how natural selection continues to shape human biology.</div>
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<div><strong>Adaptation to High Altitude</strong></div>
<div>Unlike lowland populations who experience an increase in haemoglobin levels to compensate for low oxygen, Tibetans have evolved a different strategy. Their bodies optimize oxygen intake without excessively thickening the blood, reducing the risks associated with high haemoglobin levels, such as cardiovascular complications.</div>
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<div>According to Beall, Tibetan women show distinct physiological traits compared to non-native populations at high altitudes:</div>
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<div><strong>1)</strong> Lower haemoglobin concentrations</div>
<div><strong>2)</strong> Higher oxygen saturation levels in haemoglobin</div>
<div><strong>3)</strong> Increased blood flow in the uterine artery, leading to heavier newborns and greater reproductive success</div>
<div><strong>4) </strong>These traits allow Tibetan women to maintain better oxygen delivery to both their own bodies and their children, ensuring higher survival rates.</div>
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<div><strong>Living Example of Human Evolution</strong></div>
<div>&ldquo;Adaptation to high-altitude hypoxia is fascinating because the stress is severe, experienced equally by everyone at a given altitude, and quantifiable,&rdquo; Beall told ScienceAlert. &ldquo;It is a beautiful example of how and why our species has so much biological variation.&rdquo;</div>
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<div>This research shows that human evolution is still an ongoing process, as our bodies continue to adapt to our surroundings.</div>
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<div>The Tibetan Plateau, which has been inhabited for over 10,000 years, serves as a remarkable case study of human evolution in extreme environments. As our surroundings continue to change, this research underscores the fact that human evolution is far from over&mdash;our bodies are still adapting to the world around us.</div>
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Tibetan women have lower concentrations of haemoglobin

People who inhabit the region have developed physiological traits to survive in the harsh land

Why the Tibetan Plateau Holds the Key to Human Evolution

People who inhabit the region have developed physiological traits to survive in the harsh land

February 8, 2025 | 19:35 IST