Green Tea

Overview

Green tea provides catechins (especially EGCG), L-theanine, and polyphenols that support cognitive function, antioxidant defenses, and metabolic health. Green tea contributes manganese and small amounts of fluoride and potassium, alongside polyphenols that support antioxidant defenses. Green tea catechins (e.g., EGCG, EGC) contribute to visceral adipose tissue reduction and neuroprotective effects in Green Mediterranean Diet studies, which showed attenuated brain atrophy by ~50%. Green tea is also mentioned as a polyphenol antimicrobial for SIBO suppression.

Recipes

1 recipe containing this food

Matcha Mitochondria Smoothie

Mitochondrial energising smoothie rich in polyphenols, magnesium, and antioxidants

Substances

4 substances in this food

EGCG (Green Tea Catechin)

Polyphenol; antioxidant; gut barrier/LPS modulation; supports microbiome

L-Theanine

Calming amino acid from tea; increases alpha waves; sleep-friendly

Manganese

Cofactor for MnSOD (SOD2); mitochondrial antioxidant defense

Potassium

Electrolyte for nerve transmission, muscle function, and blood pressure regulation

Preparation Notes

• Steep at lower temperatures to preserve catechins and prevent degradation
• Can reduce non-heme iron absorption if taken with meals; space ≥1 hour from iron-rich meals or add lemon (vitamin C) to mitigate this
• Green tea catechins increase Faecalibacterium and Roseburia; inhibit Enterobacteriaceae; reduce NF-κB activation
• L-theanine found in green tea increases alpha waves and calms without sedation

Biological Target Matrix

Biological Target	Substance	Contribution Level	Therapeutic Areas	Mechanism of Action
Gut Microbiome	EGCG (Green Tea Catechin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD	Green tea catechins increase Faecalibacterium and Roseburia; inhibit Enterobacteriaceae; reduce NF-κB activation
Hormonal Response	EGCG (Green Tea Catechin)	Contextual / minor contributor	ADHD, Anxiety & GAD	Supports HPA axis regulation and stress response
Hormonal Response	L-Theanine	Contextual / minor contributor	ADHD, Anxiety & GAD	Contributes to HPA axis buffering and stress response modulation
Inflammation	EGCG (Green Tea Catechin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Polyphenol antioxidant and anti-inflammatory effects; reduces inflammatory signaling
Mitochondrial Support	Manganese	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Supports mitochondrial antioxidant defense through MnSOD activity
Neurochemical Balance	L-Theanine	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Supports GABAergic tone and neurotransmitter balance
Neurochemical Balance	Potassium	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Critical for membrane potential, nerve signaling, and neuronal excitability; adequate intake balances sodium effects
Oxidative Stress	EGCG (Green Tea Catechin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Supports antioxidant defenses; part of antioxidant network
Oxidative Stress	Manganese	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Alzheimer's Disease, Bipolar Disorder	Essential cofactor for MnSOD (SOD2), supporting detoxification of superoxide within the mitochondrial matrix
Stress Response	EGCG (Green Tea Catechin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD	Contributes to stress buffering through polyphenol effects
Stress Response	L-Theanine	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD	Increases alpha waves and promotes calm without sedation; supports relaxation

References

• Green tea contributes manganese and small amounts of fluoride and potassium, alongside polyphenols that support antioxidant defenses
• Green tea catechins (e.g., EGCG, EGC) contribute to visceral adipose tissue reduction and neuroprotective effects in Green Mediterranean Diet studies Zelicha et al. 2022
• Green Mediterranean Diet attenuated brain atrophy by ~50%, with glycemic control contributing to the neuroprotective signal, consistent with polyphenol–fibre–microbiome synergy Pachter et al. 2024
• Polyphenol antimicrobials (berberine, oregano, green tea) for SIBO suppression
• Exercise-induced BDNF surges can be potentiated by polyphenols (e.g., blueberries, green tea)
• Polyphenol sources including green tea catechins increase Faecalibacterium and Roseburia; inhibit Enterobacteriaceae; reduce NF-κB activation
• GABA: Main inhibitory neurotransmitter; food sources include green tea, fermented foods, polyphenols (genistein), spinach, almonds, pumpkin seeds