Effects of timing of acute catechin-rich green tea ingestion on postprandial glucose metabolism in healthy men

Green tea polyphenols, particularly catechins, decrease fasting and postprandial glucose. However, no studies have compared the timing of green tea ingestion on glucose metabolism and changes in catechin concentrations. Here, we examined the effects of timing of acute catechin-rich green tea ingesti...

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Published in:The Journal of nutritional biochemistry 2019-11, Vol.73, p.108221-108221, Article 108221
Main Authors: Takahashi, Masaki, Ozaki, Mamiho, Miyashita, Masashi, Fukazawa, Mayuko, Nakaoka, Takashi, Wakisaka, Takuya, Matsui, Yuji, Hibi, Masanobu, Osaki, Noriko, Shibata, Shigenobu
Format: Article
Language:English
Subjects:
Circadian rhythm
Epigallocatechin gallate
Glucose metabolism
Incretin
Meal timing
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Summary:Green tea polyphenols, particularly catechins, decrease fasting and postprandial glucose. However, no studies have compared the timing of green tea ingestion on glucose metabolism and changes in catechin concentrations. Here, we examined the effects of timing of acute catechin-rich green tea ingestion on postprandial glucose metabolism in young men. Seventeen healthy young men completed four trials involving blood collection in a fasting state and at 30, 60, 120, and 180 min after meal consumption in a random order: 1) morning placebo trial (09:00 h; MP trial), 2) evening placebo trial (17:00 h; EP trial), 3) morning catechin-rich green tea trial (09:00 h; MGT trial), and 4) evening catechin-rich green tea trial (17:00 h; EGT trial). The concentrations of glucose at 120 min (P=.031) and 180 min (P=.013) after meal intake were significantly higher in the MGT trials than in the MP trials. Additionally, the concentration of glucose was significantly lower in EGT trials than in the EP trials at 60 min (P=.014). Moreover, the concentrations of glucose-dependent insulinotropic polypeptide were significantly lower in the green tea trials than in the placebo trials at 30 min (morning: P=.010, evening: P=.006) and 60 min (morning: P=.001, evening: P=.006) after meal intake in both the morning and evening trials. Our study demonstrated that acute ingestion of catechin-rich green tea in the evening reduced postprandial plasma glucose concentrations.
ISSN:0955-2863
1873-4847
DOI:10.1016/j.jnutbio.2019.108221