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Related Experiment Videos

Black tea consumption does not protect low density lipoprotein from oxidative modification

G T McAnlis1, J McEneny, J Pearce

  • 1Department of Food Science, The Queens University of Belfast, N. Ireland.

European Journal of Clinical Nutrition
|April 16, 1998
PubMed
Summary

Black tea did not significantly alter plasma antioxidant capacity or low-density lipoprotein (LDL) oxidation in healthy adults, despite in vitro antioxidant effects. Moderate consumption showed no acute or chronic impact on LDL oxidation markers.

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Area of Science:

  • Cardiovascular Health
  • Nutritional Science
  • Biochemistry

Background:

  • Oxidative modification of low-density lipoprotein (LDL) is a key factor in atherosclerosis.
  • Black tea contains flavonoids with known antioxidant properties.
  • Understanding the in vivo effects of black tea on LDL oxidation is crucial for cardiovascular health assessment.

Purpose of the Study:

  • To investigate the in vitro and in vivo effects of black tea consumption on the oxidative modification of LDL.
  • To determine if black tea consumption impacts plasma antioxidant capacity.
  • To assess the influence of acute and chronic black tea intake on LDL susceptibility to oxidation.

Main Methods:

  • In vitro antioxidant activity assessed by measuring LDL resistance to copper-induced oxidation in the presence of black tea extract.

Related Experiment Videos

  • In vivo acute study: Healthy subjects consumed black tea, with blood samples collected over 3 hours.
  • In vivo chronic study: A randomized crossover trial comparing black tea and coffee consumption over four weeks.

    • Main Results:

    • Black tea extract demonstrated a concentration-dependent increase in LDL resistance to oxidation in vitro.
    • No significant changes in plasma total antioxidant capacity or LDL oxidation susceptibility were observed within 3 hours post-acute black tea consumption.
    • Neither acute nor chronic black tea consumption significantly altered plasma antioxidant capacity, LDL oxidation, or serum lipid profiles compared to baseline or coffee consumption.

    Conclusions:

    • Moderate consumption of black tea, whether acutely or over a short period, does not enhance plasma total antioxidant capacity.
    • Black tea consumption does not alter the susceptibility of LDL to oxidation in vivo.
    • The study suggests limited impact of moderate black tea intake on key markers of oxidative stress related to LDL in healthy individuals.