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Tea Compounds and the Gut Microbiome: Findings from Trials and Mechanistic Studies

1
Tea & Infusions Association Ltd, London WC1A 2SL, UK
2
Nutrition Insight Ltd, Surrey KT17 2AA, England, UK
*
Author to whom correspondence should be addressed.
Nutrients 2019, 11(10), 2364; https://doi.org/10.3390/nu11102364
Received: 15 August 2019 / Revised: 16 September 2019 / Accepted: 21 September 2019 / Published: 3 October 2019
(This article belongs to the Special Issue Dietary Compounds Impact on Human Gut Microbiome and Gut Health)
In recent years, the gut microbiome has become a focal point of interest with growing recognition that a well-balanced gut microbiota composition is highly relevant to an individual's health status and well-being. Its profile can be modulated by a number of dietary factors, although few publications have focused on the effects of what we drink. The present review performed a systematic review of trials and mechanistic studies examining the effects of tea consumption, its associated compounds and their effects on the gut microbiome. Registered articles were searched up to 10th September 2019, in the PubMed and Cochrane library databases along with references of original articles. Human trials were graded using the Jadad scale to assess quality. Altogether 24 publications were included in the main review—six were human trials and 18 mechanistic studies. Of these, the largest body of evidence related to green tea with up to 1000 mL daily (4–5 cups) reported to increase proportions of Bifidobacterium. Mechanistic studies also show promise suggesting that black, oolong, Pu-erh and Fuzhuan teas (microbially fermented ‘dark tea’) can modulate microbial diversity and the ratio of Firmicutes to Bacteroidetes. These findings appear to support the hypothesis that tea ingestion could favourably regulate the profile of the gut microbiome and help to offset dysbiosis triggered by obesity or high-fat diets. Further well-designed human trials are now required to build on provisional findings.
Keywords: tea; tea compounds; gut microbiome; polyphenols tea; tea compounds; gut microbiome; polyphenols
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Bond, T.; Derbyshire, E. Tea Compounds and the Gut Microbiome: Findings from Trials and Mechanistic Studies. Nutrients 2019, 11, 2364.

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