Abstract
Obejective: Firstly, to study the effect of tea and tea polyphenols on cardiovascular risk indicators of the inflammatory system (IL6, IL1β and TNF-α, CRP), and on haemostasis and endothelial proteins with an acute phase behaviour (fibrinogen, vWF, PAI-1, FVIIa and u-PA). Secondly, to study the relationship between plasma levels of antioxidants (α-tocopherol, β-carotene and vitamin C) and these acute-phase, cardiovascular risk indicators.
Design: Randomized study.
Subjects: Sixty-four smoking healthy volunteers were recruited by newspaper advertisements; there were five dropouts.
Intervention: Four-week administration of black tea, green tea, green tea polyphenol isolate and mineral water (13–16 per group).
Measures: Plasma levels of the inflammatory markers IL6, IL1β, TNF-α, CRP, fibrinogen, vWF, PAI-1, FVIIa and u-PA and of the antioxidants α-tocopherol, β-carotene and vitamin C.
Results: Different dosages of tea polyphenols had no effect on inflammation, haemostasis and endothelial markers. There was a significant negative correlation between the levels of the antioxidant β-carotene and the inflammation markers IL6 and fibrinogen (r=−0.35 and r=−0.37, respectively, P<0.01) in this group of smokers. Remarkably, there was a significant positive correlation between the levels of the antioxidant α-tocopherol and the inflammation marker IL6 (r=0.28, P<0.05).
Conclusions: Tea drinking had no effect on the levels of the inflammation, haemostasis and endothelial cardiovascular risk factors measured. We did observe a relationship between the antioxidant variables α-tocopherol and β-carotene and inflammation markers in this group of healthy smoking subjects.
Sponsorship: This work was supported in part by Unilever Research, Vlaardingen, The Netherlands.
European Journal Of Clinical Nutrition (2000) 24, 757–763
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Guarantor: MPM de Maat.
Contributors: MPM de Maat contributed to the design of the study and the analysis. H Pijl provided clinical expertise. C Kluft contributed to the design of the study. HGM Princen contributed to the design and analysis. The paper was written and approved by all the investigators.
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de Maat, M., Pijl, H., Kluft, C. et al. Consumption of black and green tea has no effect on inflammation, haemostasis and endothelial markers in smoking healthy individuals. Eur J Clin Nutr 54, 757–763 (2000). https://doi.org/10.1038/sj.ejcn.1601084
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DOI: https://doi.org/10.1038/sj.ejcn.1601084
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