Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Tea polyphenols, particularly those found in green tea such as epigallocatechin gallate (EGCG), have been explored for their potential benefit in gastrointestinal health due to their antioxidant, anti-inflammatory, and antimicrobial properties. Several in vitro and animal studies suggest that tea polyphenols may modulate gut microbiota, reduce intestinal inflammation, and improve intestinal barrier function—all mechanisms that could theoretically benefit individuals with Irritable Bowel Syndrome (IBS). Additionally, there are a few small-scale human studies and clinical trials that have investigated the effects of green tea extracts on gastrointestinal symptoms, with some showing modest improvements in symptoms such as bloating and abdominal pain in IBS patients. However, these clinical studies are limited in size, methodology, and duration; results are inconsistent, and optimal dosing is unclear. Major clinical guidelines for IBS management do not currently recommend tea polyphenols as a standard therapy due to insufficient high-quality evidence. In summary, while the mechanistic rationale and preliminary data provide some support for the use of tea polyphenols in IBS, robust, large-scale randomized controlled trials are lacking, and the current level of scientific evidence is low to moderate.

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