A bad taste in your mouth - moral outrage has origins in physical disgust
Posted on: February 27, 2009 8:30 AM, by Ed Yong
Both objects and behaviour can be described as disgusting. The term could equally apply to someone who cheats other people out of money as it could to the sight of rancid food or the taste of sour milk. That's not just a linguistic quirk. Some scientists believe that the revulsion we feel towards immoral behaviour isn't based on our vaunted mental abilities, but on ancient impulses that evolved to put us off toxic or infectious foods...