The emotion of disgust evolved initially to optimize responses to the omnivore's dilemma. Individuals who had a properly calibrated sense of disgust were able to consume more calories than their overly disgustable cousins while consuming fewer dangerous microbes than their insufficiently disgustable cousins.
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About Jonathan Haidt
Jonathan Haidt was a contemporary American social psychologist. Jonathan David Haidt is an American social psychologist and author. He is the Thomas Cooley Professor of Ethical Leadership at the New York University Stern School of Business. Read more on Wikipedia →