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Hormesis: how it could affect the risk assessment process.

Edward J Calabrese1, Ralph R Cook

  • 1Environmental Health Sciences, Morrill I, N344, University of Massachusetts, Amherst, MA 01003, USA. edwardc@schoolph.umass.edu

Human & Experimental Toxicology
|July 12, 2005
PubMed
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Adopting hormesis as a default model could redefine environmental safety standards by recognizing carcinogens have a threshold, not linear, low-dose effect. This approach offers broader exposure options for public health and potential benefits.

Area of Science:

  • Toxicology
  • Environmental Health
  • Risk Assessment

Background:

  • The current default dose-response model in risk assessment has limitations.
  • Hormesis, a concept of non-linear dose-response, is often overlooked.
  • This has implications for setting environmental exposure standards.

Purpose of the Study:

  • To explore the implications of adopting the hormetic dose-response model as the default for risk assessment.
  • To analyze how this shift would affect environmental exposure standards for carcinogens and noncarcinogens.
  • To discuss the potential benefits of hormesis for public health and regulatory options.

Main Methods:

  • Conceptual analysis of dose-response models in toxicology.
  • Review of regulatory approaches to risk assessment.

Related Experiment Videos

  • Examination of the scientific basis for hormesis.

    • Main Results:

    • Accepting hormesis would challenge the linearity-at-low-doses concept for carcinogens, suggesting a threshold effect.
    • It would enable a wider array of toxicologically informed exposure options.
    • Regulatory agencies could consider both harm avoidance and potential health benefits.

    Conclusions:

    • Dismissing hormesis may prevent regulatory agencies from optimizing public health outcomes.
    • Incorporating hormesis could lead to more nuanced and potentially beneficial environmental exposure standards.
    • This paradigm shift could enhance disease avoidance and promote optimal health for diverse populations.