The Science of Chronic Inflammation
Inflammation is not inherently harmful — it is the immune system's essential first response to injury or infection. The problem is chronic low-grade inflammation: a persistent, low-level immune activation that contributes to cardiovascular disease, type 2 diabetes, and Alzheimer's over decades. Diet is one of the most powerful levers for modulating this process.
The Dietary Inflammatory Index (DII), developed at the University of South Carolina, scores over 45 food components on their ability to shift biomarkers of inflammation (CRP, IL-6, TNF-α) up or down. This tool draws on those findings to give you a practical daily snapshot.
| Food Category | Effect | Key Mechanism |
|---|---|---|
| Fatty fish (salmon, sardines) | Anti-inflammatory | Omega-3 EPA and DHA suppress inflammatory cytokine production |
| Colourful vegetables and berries | Anti-inflammatory | Polyphenols and flavonoids inhibit NF-κB inflammatory signalling |
| Extra-virgin olive oil | Anti-inflammatory | Oleocanthal acts similarly to ibuprofen; oleic acid reduces IL-6 |
| Turmeric and ginger | Moderate anti-inflammatory | Curcumin and gingerols inhibit the COX-2 enzyme pathway |
| Ultra-processed foods and refined sugars | Pro-inflammatory | Trigger postprandial inflammatory response; feed dysbiotic bacteria |
| Trans fats and refined seed oils | Pro-inflammatory | Increase LDL oxidation; promote systemic inflammatory signalling |
Shifting Your Score Over Time
Additive, not restrictive
Research shows additive strategies (adding anti-inflammatory foods) produce better long-term adherence than elimination strategies. Each anti-inflammatory food added also naturally displaces a pro-inflammatory equivalent.
The gut microbiome as the mechanism
Much of the anti-inflammatory effect of a plant-rich diet operates via the gut microbiome. Dietary fibre feeds bacteria that produce short-chain fatty acids (SCFAs), which directly reduce intestinal inflammation and strengthen the gut barrier.
Timeline of improvement
Measurable improvements in inflammatory biomarkers (CRP, IL-6) typically appear within 4-8 weeks of consistent dietary change. Score daily, but assess meaningful change monthly.
The 80/20 principle applies
Research on Mediterranean dietary adherence shows that scoring high on 80% of days produces similar biomarker improvements to perfect adherence — without the social friction that drives abandonment.