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The Human Microbiota and Its Relationship with Allergies.

Nanna Fyhrquist1

  • 1Institute of Environmental Medicine, Karolinska Institutet, Box 210, Stockholm 17177, Sweden; Department of Bacteriology and Immunology, Medicum, University of Helsinki, Helsinki, Finland.

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Summary

The modern lifestyle, with reduced microbial exposures, is linked to the rise in allergic diseases. Changes in the human microbiota significantly impact immune system regulation and increase allergy risk.

Keywords:
Allergic diseaseBiodiversity hypothesisDysbiosisHuman microbiota

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Area of Science:

  • Immunology
  • Microbiology
  • Public Health

Background:

  • Allergic diseases have reached epidemic levels globally, particularly in high-income nations.
  • Modern lifestyles, characterized by altered diets and hygiene, are associated with reduced microbial exposures.
  • The human microbiota plays a crucial role in physiological regulation and overall health.

Purpose of the Study:

  • To explore the connection between the allergy epidemic and decreased microbial contact.
  • To investigate the role of the human microbiota in immune system regulation.
  • To understand how alterations in microbiota composition influence allergy development.

Main Methods:

  • Review of recent evidence linking lifestyle, microbial exposure, and allergic diseases.
  • Analysis of the impact of microbiota on immune system development and function.
  • Examination of the mechanisms of microbiota-immune system interaction.

Main Results:

  • Reduced microbial exposure due to modern living is a potential driver of the allergy epidemic.
  • The human microbiota is critical for educating and regulating the immune system.
  • Significant shifts in microbiota composition are associated with increased susceptibility to allergies.

Conclusions:

  • The increasing prevalence of allergies may be attributed to a loss of beneficial microbial interactions.
  • Understanding microbiota dynamics is essential for developing strategies to prevent and manage allergic diseases.
  • Further research into microbiota-host interactions is needed to elucidate allergy pathogenesis.