Green tea is one of the most researched plants on earth. Its primary polyphenol, EGCG (epigallocatechin gallate), is metabolised by gut bacteria into postbiotic compounds — specifically valerolactones and valeric acids — that have potent anti-inflammatory, anti-cancer, and neuroprotective effects. Regular green tea consumption is one of the strongest dietary correlates of longevity across multiple epidemiological studies in Japan.
Why it matters
EGCG Postbiotic Metabolites
Gut bacteria convert EGCG into valerolactones — powerful anti-inflammatory postbiotics.
Increases Akkermansia
Selectively feeds Akkermansia muciniphila — a keystone species for gut barrier health.
Anti-cancer Properties
EGCG metabolites induce apoptosis in cancer cells and inhibit tumour angiogenesis.
Cognitive Protection
Regular consumption is linked to reduced risk of Alzheimer's and Parkinson's disease.
How to eat it
Brew at 70-80°C — not boiling, which destroys EGCG and makes it bitter. Steep for 2-3 minutes. Drink 2-3 cups daily between meals for maximum absorption. Matcha (ground whole green tea leaf) provides 10-15x the EGCG of brewed green tea. Avoid adding milk — the proteins bind to the polyphenols and reduce bioavailability.
EGCG metabolites produced by gut bacteria have been shown to selectively increase Akkermansia muciniphila — a species strongly associated with lean body composition, reduced inflammation, and improved gut barrier function.
Source: Zhao et al., Journal of Nutritional Biochemistry, 2019
Pairs well with
Build the food system inside you.
One food at a time. Subscribe to the EatoBiotics Substack for weekly food profiles, science-backed insights, and practical plate-building guidance.