Although advances in medical care have improved standards of living over time, humans aren't entirely sheltered from the forces of natural selection, a new study says. “There is this idea that because medicine has been so good at reducing mortality rates, that means that natural selection is no longer operating in humans,” says Stephen Stearns of Yale University.

A recent analysis by Stearns and his colleagues turns this idea on its head. The team of researchers decided to find out if natural selection — a major driving force of evolution — is still at work in humans today. The study, published in the Proceedings of the National Academy of Sciences, finds human evolution hasn't ground to a halt. In fact, humans are likely to evolve at roughly the same rates as other living things, findings suggest.

Taking advantage of data collected as part of a 60-year study of more than 2,000 North American women in the Framingham Heart Study, the researchers analyzed a handful of traits important to human health. By measuring the effects of these traits on the number of children the women had over their lifetime, the researchers were able to estimate the strength of selection and make short-term predictions about how each trait might evolve in the future. After adjusting for factors such as education and smoking, their models predict that the descendents of these women will be slightly shorter and heavier, will have lower blood pressure and cholesterol, will have their first child at a younger age, and will reach menopause later in life. “The take-home message is that humans are currently evolving,” Stearns says. “Natural selection is still operating.”

The changes may be slow and gradual, but the predicted rates of change are no different from those observed elsewhere in nature, the researchers say. “The evolution that's going on in the Framingham women is like average rates of evolution measured in other plants and animals,” Stearns says. “These results place humans in the medium-to-slow end of the range of rates observed for other living things. But what that means is that humans aren't special with respect to how fast they're evolving. They're kind of average.”