Journal
NUTRIENTS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nu10050569
Keywords
green tea cv; Sunrouge or Yabukita; anthocyanins; flavonols; eyestrain reducing effect; blood pressure elevating effect; adiponectin level increasing effect
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Funding
- Ministry of Agriculture, Forestry and Fisheries of Japan
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The green tea (Camellia sinensis L.) cultivar Sunrouge contains anthocyanins, catechins and flavonols. To determine whether ingesting green tea containing anthocyanins improves visual function and blood pressure (BP) in healthy adults, a randomized, double-blind, placebo-controlled study was performed. A total of 120 healthy subjects, aged between 20 and 60 years and with a systolic BP (SBP) value of 125 and <155 and a diastolic BP (DBP) value <95, or a DBP of 75 mmHg and <95 mmHg and a SBP <155 mmHg, were randomly assigned to one of three groups. For 12 weeks, the placebo group received barley extract without catechin; another group received Sunrouge extract containing 11.2 mg anthocyanin and 323.6 mg epigallocatechin-3-O-gallate (EGCG); and a third group received Yabukita extract containing 322.2 mg EGCG. Home BP, accommodation ability, visual analog scale questionnaires for eyestrain, and metabolic-associated markers were analyzed at weeks 0, 4, 8, and 12 of the intake period. The ingestion of Sunrouge tea significantly improved accommodation ability and eyestrain in subjects younger than 45 years and in subjects who operated visual display terminals every day. It also elevated BP. Yabukita tea ingestion significantly increased serum adiponectin levels. No adverse effects were observed. We conclude that long-term intake of Sunrouge tea containing anthocyanins and flavonols might improve visual function.
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