Study
Soy Supplements May Ease Asthma Symptoms in Adults
Taking a daily soy supplement for four weeks reduced asthma-related inflammation by 33% in a study of adults.
Summary
In plain language
New research suggests that including soy in your diet might help reduce asthma symptoms. In a study, adults with asthma who took a soy supplement daily for four weeks experienced a 33% reduction in inflammation, a key factor in asthma. This finding is important because it points to a natural dietary approach that might support better breathing. If you or someone you know lives with asthma, it could be worth considering adding soy products to your diet. However, it's always best to talk with your healthcare provider before making any changes to your health regimen.
Details
Use the full description to understand the study design, methods, and the limits of the findings.
This study explored the effects of soy supplements on asthma-related inflammation in adults. Researchers provided participants with a daily soy supplement containing genistein, a compound found in soy, for four weeks.
The study found a 33% reduction in specific inflammatory markers associated with asthma.
Participants also showed an 18% decrease in exhaled nitric oxide, which indicates reduced airway inflammation.
While the study showed promising results, it included only a small group of participants, meaning larger studies are needed to confirm these findings.
For seniors considering dietary changes, discussing the potential benefits of soy with a healthcare provider is a wise step.
Full Study
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Soy Supplements May Ease Asthma Symptoms in Adults
Published October 2026
Opens at the publisher · external site · may require institutional access
Research Quality Score
Scored October 26, 2026 using rubric mq-1.8_2026-07-06.
Assessment
The study is a single-arm observational study with in vitro and clinical components, lacking randomization and blinding. Statistical methods are standard but lack full power analysis. Transparency is moderate with registration but no data sharing. Conflicts of interest are disclosed but involve industry funding. The study does not specifically target older adults, and journal quality is unassessed.
Category Breakdown
| Category | Score | Rating |
|---|---|---|
| Study design | 3.3/10 | |
| Bias control | 3.3/10 | |
| Statistical methods | 5.0/10 | |
| Reporting completeness | 5.0/10 | |
| Conflicts & funding | 5.0/10 | |
| Replication | 0.0/10 | |
| Relevance to chosen population | 0.0/10 | |
| Journal Reliability | 5.0/10 |
Additional Notes
The study investigates the effects of soy isoflavone genistein on eosinophil leukotriene synthesis and airway inflammation in asthma patients. It includes in vitro experiments and a 4-week pilot clinical trial showing reduced eosinophil activity and inflammation markers.
Assessed on the study's full text across 8 quality dimensions; conflict-of-interest disclosures were reviewed.
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