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Disgusting odors trigger the oral immune system.

Stephanie Anja Juran1, Arnaud Tognetti1, Johan N Lundström1

  • 1Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.

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Disgusting odors, linked to disease, can activate the human immune system. Exposure to these sickness cues increases saliva tumor necrosis factor-alpha (TNFα), preparing the body to fight potential infections.

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Area of Science:

  • Immunology
  • Behavioral Science
  • Olfactory Neurobiology

Background:

  • Behavioral defenses against disease involve detecting and reacting to sickness cues, often mediated by disgust.
  • The immune response of individuals observing sickness cues is a less-explored aspect of disease defense.
  • Olfaction plays a crucial role in conveying sickness cues, with odors linked to disease and disgust.

Purpose of the Study:

  • To investigate whether olfactory sickness cues (disgusting odors) can elicit a preparatory immune response in humans.
  • To examine the link between disgust perception, immune markers, and exposure to disease-associated odors.

Main Methods:

  • Thirty-six participants were exposed to disgusting odors.
  • Subjective and objective measures of disgust were recorded.
  • Salivary levels of tumor necrosis factor-alpha (TNFα) were measured immediately after odor exposure.

Main Results:

  • Exposure to disgusting odors led to increased subjective and objective disgust.
  • Salivary TNFα levels significantly increased following exposure to disgusting odors.
  • These findings indicate an immediate immune response in the oral cavity to olfactory disease cues.

Conclusions:

  • Disgusting odors act as sickness cues that can trigger a preparatory immune response in the human oral cavity.
  • This suggests a coordinated defense system involving behavioral avoidance (olfaction, disgust) and innate immunity (inflammatory mediators).
  • The findings highlight the role of olfaction and disgust in initiating protective immune mechanisms against potential pathogens.