Speaking of Psychology Yuck! What disgusts us and why, with Paul Rozin, PhD
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Feb 19, 2025 
Paul Rozin, PhD, is a psychology professor emeritus at the University of Pennsylvania and a leading expert on disgust. He discusses the origins and evolution of disgust as a protective mechanism, highlighting cultural variations in food aversions. Rozin explains how humor can stem from disgust, showcasing the lighter side of this complex emotion. He also explores the psychological barriers related to dietary choices and the intricate relationships between disgust, morality, and societal norms.
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Origins of Disgust
- Disgust likely evolved to protect humans from harmful microbes, primarily those found in animal products.
- It's uniquely human and develops between ages three and five, often linked to toilet training.
Self-Disgust
- People are less disgusted by their own bodily waste than others'.
- This may be due to constant exposure and the understanding that it poses less risk.
Disgust as an Emotion
- Disgust is a basic emotion with a characteristic facial expression, physiological response (nausea), and behavioral withdrawal.
- It requires mental appraisal of the disgusting stimulus.