The Study
IMPACT OF A HIGH-POLYPHENOL ROOIBOS TEA INTERVENTION ON POSTPRANDIAL LIPEMIA AND ENDOTHELIAL FUNCTION IN ADULTS WITH METABOLIC SYNDROME
This study gave one group of people rooibos tea every day and another group a fake tea, then checked how their bodies reacted after eating fatty food. It found that the tea group had better blood vessel function and lower fat levels after meals — so the tea probably helped. But we can't say it definitely fixes heart problems because the study was short and only looked at one meal.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study tested if drinking a specific herbal tea every day for six weeks helps your body handle fat after meals and makes your blood vessels work better.
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 548 / 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 — even though weight and fasting blood sugar didn’t change, the tea helped reduce the dangerous spike in fat and improved how well blood vessels relax after eating, which lowers heart disease risk.
- 2People who drank the tea saw their post-meal fat levels drop by 11% and their blood vessel function improve by 22%.
- 3Those who drank the fake tea saw almost no change.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Axis Journal of Agriculture & Biological Sciences
Year
2025
Authors
Tahira Jamil, Vaneeza Iftikhar
Related Content
Claims (6)
Consuming coffee and tea containing polyphenols is associated with lower levels of oxidative stress and better blood vessel function.
Adults with metabolic syndrome who drink high-polyphenol rooibos tea daily for six weeks have an 11% lower increase in blood triglycerides after meals compared to those who do not.
Adults with metabolic syndrome who drank high-polyphenol rooibos tea daily for six weeks experienced a 22% increase in blood vessel function measured by flow-mediated dilation, while those who did not drink the tea saw only a 4% increase.
Drinking high-polyphenol rooibos tea every day for six weeks does not change body weight, waist size, fasting blood sugar, or fasting insulin levels in adults with metabolic syndrome.
Adults with metabolic syndrome who drank high-polyphenol rooibos tea every day for six weeks did not experience any adverse effects and showed improvements in blood sugar and lipid responses after meals.
Drinking high-polyphenol rooibos tea for six weeks improves blood vessel function and fat metabolism after meals in adults with metabolic syndrome, but does not change blood markers measured after fasting.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.