For all of humanity’s achievements, evolution never truly stops. Recent research shines a light on a unique type of evolution happening high in the Andes, and it all revolves around the humble potato.
The Quechua people, who have thrived in this mountainous region for thousands of years, show a remarkable ability to digest starch. This adaptation likely stems from their long history of domesticating potatoes, dating back around 10,000 years. According to anthropologist Abigail Bigham from UCLA, “The Andes offer a fascinating look into how humans adapt not just to extreme conditions, but also to dietary changes.”
As we evolve, we’re shaped by the challenges we face. Some challenges are harsh, like lack of oxygen, while others might be gentler, like the foods we consume. A few years ago, researchers discovered that the Indigenous populations in the Peruvian Andes have genetic traits that enhance their ability to digest starch compared to people who adopted potatoes more recently. In their latest study, they found that the Quechua people possess an incredible number of gene copies called AMY1, which is crucial for breaking down starch.
According to evolutionary anthropologist Omer Gokcumen from the University at Buffalo, evidence shows that these adaptations aren’t merely chance occurrences. The average person has between 2 and 20 AMY1 gene copies. In contrast, the Quechua people have a median of 10 copies—enough to give them a significant survival advantage. This suggests that those with fewer copies may have struggled more to thrive.
Gokcumen notes, “This adaptation took place over generations. Those with higher AMY1 copies thrived and had more offspring, while others faded from the gene pool.” The rise of these adaptations aligns perfectly with the domestication of the potato, hinting at a direct link between diet and evolution.
Interestingly, populations like the Maya, who didn’t cultivate potatoes, lack this particular adaptation. That raises questions about how food choices can shape our biology. This research even sheds light on today’s global food culture, where many of us eat foods from around the world rather than sticking to traditional diets.
In a time when discussions about diets, like the paleo diet, are trending, this study reminds us how quickly we can adapt to our eating habits. As evolutionary geneticist Kendra Scheer points out, “The evolution we see in the Andes highlights that the dietary changes we embrace today may also push our evolution forward.”
In short, the Quechua people’s adaptation shows a fascinating intersection of culture, evolution, and diet. It adds depth to our understanding of how human beings continue to change. For a deeper dive into this research, check out the study published in Nature Communications.
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