The Study
Effects of fermented versus unfermented red cabbage on symptoms, immune response, inflammatory markers and the gut microbiome in young adults with allergic rhinoconjunctivitis: a randomised controlled trial protocol
This study is like a fair test where half the kids ate fermented cabbage and half ate regular cooked cabbage, and no one knew who got which until after. It can tell us if the fermented kind probably helped with sneezing, but it can't say it's the only thing that helped or that it works for everyone.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study gives people with seasonal allergies either pickled cabbage (sauerkraut) or cooked plain cabbage every day for 8 weeks to see if the pickled kind helps more.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 585 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1If pickled cabbage works better, it could be a simple, food-based way to reduce allergy symptoms and improve daily life without drugs.
- 2Participants will eat 75g daily; researchers will measure nose/eye symptoms, anxiety, inflammation (CRP), immune cells (eosinophils), and gut bacteria before and after.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
BMJ Open
Year
2026
Authors
G. Ngoumou, S. Ngandeu Schepanski, Sarah B. Blakeslee, A. Diedering, Emily Twal, Sasha Louise Raue, Maik Schroeder, W. Wicaksono, W. Stritter, Gabriele Berg, Georg Seifert
Related Content
Claims (3)
Young adults with allergic rhinoconjunctivitis who consume fermented red cabbage daily show higher quality of life and lower anxiety levels according to standardized psychological assessments.
The amount of pollen in the air changes how much fermented red cabbage affects allergic symptoms.
Eating fermented red cabbage changes the types and functions of bacteria in the gut of young adults with allergic rhinoconjunctivitis, according to shotgun metagenomic analysis.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.