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Do dairy products induce bronchoconstriction in adults with asthma?
R K Woods1, J M Weiner, M Abramson
1Department of Respiratory Medicine, Monash Medical School and Alfred Hospital, Melbourne, Australia.
The Journal of Allergy and Clinical Immunology
|February 4, 1998
Summary
This study found that dairy products are unlikely to cause bronchoconstriction in most asthma patients. Perceptions of dairy worsening asthma symptoms were not supported by objective measurements in this trial.
Area of Science:
- Pulmonology
- Allergy and Immunology
- Clinical Nutrition
Background:
- Asthma exacerbations are sometimes attributed to dairy product consumption.
- However, robust scientific evidence supporting this link is limited.
- This study investigates the potential of dairy to trigger asthma symptoms.
Purpose of the Study:
- To investigate if dairy products induce bronchoconstriction in adults with asthma.
- To assess the relationship between perceived dairy sensitivity and objective lung function changes.
Main Methods:
- A randomized, double-blind, placebo-controlled, cross-over trial was conducted.
- Twenty adult asthma patients (10 positive, 10 negative perceivers) participated.
- Subjects underwent a dairy challenge and placebo, with lung function (FEV1, PEF) monitored.
Main Results:
- No statistically significant differences in FEV1 or PEF were observed between dairy challenge and placebo.
- A small number of subjects showed lung function changes, but these were not consistently linked to dairy intake.
- Objective testing did not confirm a specific bronchoconstrictor effect of dairy.
Conclusions:
- Dairy products are unlikely to have a specific bronchoconstrictor effect in the majority of asthma patients.
- Perceived worsening of asthma after dairy ingestion was not objectively verified in this study.
- Findings suggest that dietary advice regarding dairy in asthma may need re-evaluation.
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