Tea's Anti-Inflammatory Effects: Comparing Green, Black, Oolong, and White Tea

Polyphenol Profiles

• Green Tea: Minimally oxidized. High catechins (EGCG 50–80% of catechins). Potent NF-κB inhibition, COX-2 suppression, Nrf2 activation.
• White Tea: Least processed (buds/young leaves). Highest catechin retention; similar EGCG to green. Limited human trials but strong in vitro anti-inflammatory data.
• Oolong Tea: Partially oxidized. Mixed catechins + theaflavins/thearubigins. Moderate anti-inflammatory activity.
• Black Tea: Fully oxidized. Catechins polymerized to theaflavins (TF1, TF2a, TF2b, TF3) and thearubigins. TFs inhibit TNF-α, IL-1β, iNOS. Human trials show CRP reduction with 3 cups/day.

Mechanisms of Action

1. Redox Modulation: Polyphenols scavenge ROS/RNS, upregulate endogenous antioxidants (SOD, GPx, catalase).
2. Signaling Inhibition: Block MAPK, NF-κB, JAK/STAT pathways → reduced cytokine transcription.
3. Gut Microbiome: Tea polyphenols act as prebiotics, enrich beneficial taxa (Akkermansia, Bifidobacterium), reduce LPS translocation → lower systemic inflammation.

Practical Considerations

• Brew 3–5 min at 80°C (green/white) or 95°C (black/oolong) for optimal extraction.
• 3–5 cups/day associated with 15–20% lower inflammatory markers in cohorts.
• Add lemon (vitamin C stabilizes catechins); avoid milk (casein may bind polyphenols—debated).
• Not a replacement for prescribed anti-inflammatory therapy.