Beyond Inheritance: Our Ever-Mutating Cells and a New Understanding of Health

by Roxanne Khamsi

The new science of how our DNA mutates over our lifetimes, with radical implications for our health and medical treatments.

We tend to think of Darwinian evolution as a process that plays out over generations. But our understanding of natural selection is itself evolving. Science writer Roxanne Khamsi reveals our bodies as active landscapes of evolution. Genetic mutations are constantly happening within your body—even as you read this.

In this astonishing book, Khamsi shows how our bodies comprise cells that change over the course of a lifetime, mutating, competing, and evolving. Our immune systems fight viruses by evolving millions of different cells that produce distinct antibodies for dealing with invaders, while cancer and bacterial cells evolve in response to our bodies’ attempts to destroy them. Meanwhile, the random mutations of cells throughout our bodies have immense potential to harm us—and heal us.

Beyond Inheritance reveals our DNA as a dynamic, mutating entity. By letting go of the antiquated idea that each cell has the same exact DNA and embracing a messier—but truer—reality, we can usher in a whole new era of medicine. Khamsi introduces readers to the scientists who are harnessing evolutionary forces to design vaccines and to battle cancer. This book will open your eyes to the immense and ongoing genetic diversity that exists within each human body and its incredible potential to impact your health and well-being.

Genres: Nonfiction, Science, Health, Audiobook

304 pages, Hardcover

First published April 21, 2026

About the author

Roxanne Khamsi is a writer and editor formerly based in Brooklyn and now living in Montreal. Her articles have appeared in publications such as The New York Times, The Economist, Popular Science, Scientific American, Slate, Nature, New York magazine, WIRED magazine and the MIT Technology Review.

Reviews

[Ericka Clou · Rating 5 out of 5]

I love reading science books (especially those about genetics, disease, or physics) and this is the ideal. It was full of new-to-me information and it was organized in a clear and engaging way.

[MICHEAL DOANE · Rating 5 out of 5]

Beyond Inheritance by Roxanne Khamsi delivers a precise and compelling reframing of one of biology’s most entrenched assumptions, that our DNA is fixed. Instead, Khamsi presents the human body as an evolving ecosystem, where mutation and selection operate continuously within us.

What makes the work particularly effective is its ability to translate complex biological processes into a coherent narrative without oversimplification. By connecting cellular evolution to immunity, cancer, and emerging therapies, the book bridges fundamental science with real-world medical implications in a way that is both intellectually rigorous and broadly accessible.

The result is a forward-looking, paradigm-shifting exploration that positions evolutionary biology not as background theory, but as an active framework for the future of medicine, one that has the potential to redefine how we diagnose, treat, and understand disease.

[Steve · Rating 4 out of 5]

I found this book informative. Although the actual science can be quite complex, I think that Khamsi did a good job of translating it into plain language. I also liked the case-based approach and the author’s journey. And I did chuckle a couple of times over some of the clever writing. Overall, this book was well worth reading. Thank you to Edelweiss and Riverhead Books for the advance reader copy.

[Kallie · Rating 4 out of 5]

This was an interesting look at what our genes on their own after we are born and they are left to their own devices. Most mutations are bad (cancer), but there were some instances of good mutations mentioned. I wanted to know how rare of an occurrence that was though, because it can't be frequent. I guess we can study it and try to replicate it when it does happen.

[Laurie · Rating 4 out of 5]

Well written and understandable.