What kinds of traits can be studied through Darwinian medicine?

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Darwinian medicine applies the principles of evolutionary biology to understand, prevent, and treat human disease. Rather than viewing the body as a perfectly designed machine, this field examines how evolutionary history and natural selection have shaped traits that may leave the body vulnerable to illness.1

Researchers in this field study five specific categories of traits acted upon by evolution:

Human traits
Human genes
Pathogen traits
Pathogen genes
Cell lines

By analyzing these traits through the lens of their phylogeny (evolutionary history) or their adaptive significance, scientists can better understand clinical phenomena. This includes investigating why certain traits—such as the narrow human birth canal or the design of the vertebrate eye—create vulnerabilities, as well as how trade-offs and engineering constraints influence health. Furthermore, the field explores how protective responses like fever, pain, and anxiety are shaped by selection to serve as useful, albeit sometimes excessive, defenses.1