The Study
The Effects of Adlay Tea Intake on Immune Homeostasis and Vascular Endothelial Function in Healthy Adults: A Randomized, Double-Blind, Parallel-Group Comparative Study.
This study gave some people adlay tea and others fake tea to see what happened. It found that the tea group had less inflammation in their blood. But it didn't check if they got sick less or lived longer—just looked at a few blood markers. So we know the tea might help with inflammation, but we don't know if it stops real diseases.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study tested if drinking adlay tea every day for 8 weeks could help calm down a type of immune cell that causes inflammation.
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 569 / 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.
- 1Yes — improved blood vessel function is linked to lower heart disease risk, especially in middle-aged and older adults.
- 2In people over 40, the tea improved blood vessel function by 15% (FMD increase) and stopped immune cells from getting more active.
- 3In people under 40, there was no change in immune activity.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of nutritional science and vitaminology
Year
2024
Authors
Hiroko Oya, Masahiro Nakano, Hiroe Shinohara, Masashi Nagai, Yosuke Takimoto, Takamasa Masuda, Kimiko Kazumura, Mika Mochizuki, Toshihiko Osawa, H. Ishikawa
Related Content
Claims (6)
Drinking adlay tea every day for eight weeks increases blood vessel function in healthy adults over 40, as measured by improved flow-mediated dilation, compared to not drinking it.
Drinking adlay tea for eight weeks does not change myeloperoxidase activity in healthy adults under 40, and this indicates that age may influence how adlay tea affects immune-related processes.
Adlay tea contains caffeic acid, p-coumaric acid, and ferulic acid, and these compounds directly inhibit myeloperoxidase activity in laboratory tests.
Drinking adlay tea for eight weeks does not change blood pressure, cholesterol levels, or blood sugar in healthy adults.
Drinking adlay tea daily for eight weeks leads to a measurable reduction in the rise of myeloperoxidase activity in neutrophils compared to not drinking it.
Consuming coffee and tea containing polyphenols is associated with lower levels of oxidative stress and better blood vessel function.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.