Neanderthal DNA Gives Some People Extra Muscle Mass

Your muscles might be getting a boost from relatives who lived 40,000 years ago.

Scientists at the Max Planck Institute for Evolutionary Anthropology just discovered that Neanderthal DNA can add extra muscle mass to modern humans. People carrying this ancient genetic variant have about 271 additional grams of muscle compared to those without it.

Most of the world's population carries 1 to 2 percent Neanderthal DNA from when our ancestors interbred tens of thousands of years ago. We've known this genetic inheritance affects our immune systems, but researchers just uncovered another surprising benefit hidden in our cells.

The team identified specific changes in the Neanderthal growth hormone receptor, a key protein that helps regulate growth throughout the body. When they tested cells in the lab, those with the Neanderthal version grew noticeably more than cells with the modern human version.

The findings help explain why Neanderthals had such robust builds. That same genetic advantage got passed down through generations and still affects millions of people today.

The variant appears most frequently in South and East Asia. In some parts of South Asia, nearly one in four people carries at least one copy of the Neanderthal receptor gene. Those who inherited it from both parents often have even more muscle mass.

The Bright Side

What makes this discovery so compelling is how perfectly the evidence fits together. Lab results showing stronger cell growth matched real-world data from over a million people, creating a clear picture of how ancient genetics still shape our bodies today.

Miriam Berreiter, a researcher at the Karolinska Institute who co-authored the study, put it in perspective with humor. As someone who does CrossFit, she was thrilled to see Neanderthal genetics and muscle mass connected in her research, but she's quick to remind people that even ancient DNA can't replace actual training.

The research opens fascinating questions about what other beneficial traits might be hiding in our Neanderthal inheritance. Scientists continue finding ways these ancient genes influence everything from our disease resistance to how our bodies grow and develop.

Whether you won the Neanderthal muscle lottery or not, this discovery celebrates the incredible story written in our DNA and the unexpected gifts from our evolutionary past.