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Caffeine intake and asthma symptoms.

J Schwartz1, S T Weiss

  • 1US Environmental Protection Agency, Washington, DC.

Annals of Epidemiology
|September 1, 1992
PubMed
Summary

Regular coffee consumption may reduce asthma symptoms. This study found coffee drinkers had a 29% lower chance of current asthma, with more coffee linked to lower prevalence.

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Area of Science:

  • Epidemiology
  • Respiratory Medicine
  • Nutritional Science

Background:

  • Methylxanthines, found in coffee and tea, are suspected pharmacologic bronchodilators.
  • Dietary factors influencing respiratory health, such as asthma, are of significant public health interest.

Purpose of the Study:

  • To investigate the association between coffee and tea consumption and the prevalence of asthma and wheezing symptoms.
  • To determine if methylxanthines in beverages act as bronchodilators influencing asthma risk.

Main Methods:

  • Analysis of data from the Second National Health and Nutrition Examination Survey (NHANES II).
  • Inclusion of a representative sample of US adults aged 30 years and older (white and black).
  • Assessment of usual coffee and tea intake via a medical history questionnaire and correlation with asthma/wheezing symptoms.

Main Results:

  • Regular coffee consumption was associated with a 29% reduction in the odds of current asthma symptoms (OR, 0.71; 95% CI, 0.55-0.93).
  • A significant inverse dose-response relationship was observed between daily coffee intake and asthma prevalence.
  • Tea consumption showed no significant association with asthma prevalence in this cohort.

Conclusions:

  • Coffee consumption appears to be a protective factor against current asthma symptoms.
  • The findings suggest a potential bronchodilator effect of coffee, warranting further investigation.
  • Tea consumption did not demonstrate a similar protective effect on asthma prevalence.

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