Why Do We Feel Disgust? An Evolutionary Biologist Explains How It Kept Our Ancestors Alive

Disgust likely evolved as a defense against contamination, helping humans avoid pathogens and survive.

Neuroscience links disgust to the anterior insula and related brain regions, which help process aversion and threat.

Today, disgust shows up in pathogen, sexual, and moral forms, shaping hygiene, mate choice, and social judgment.

The article frames disgust as part of the behavioral immune system, an ancient mechanism that still influences individual and group behavior.