Anti-Inflammatory Eating: What the Evidence Actually Says

Inflammation is not inherently bad. Acute inflammation is the immune system's correct response to injury or infection — it recruits immune cells to the site of damage, promotes healing, and resolves once the threat is gone. The problem is chronic, low-grade systemic inflammation, which persists without a clear threat and damages tissue over years.

Chronic inflammation is implicated as a driver or accelerant of cardiovascular disease, type 2 diabetes, Alzheimer's disease, several cancers, and autoimmune conditions. It is measured imperfectly through blood markers like C-reactive protein (CRP) and interleukin-6, though these are influenced by many factors.

Diet is one of the most modifiable drivers of systemic inflammation, alongside sleep, physical activity, stress, smoking, and body composition.

Ultra-processed foods (UPFs) — characterised by their use of industrial ingredients not found in home kitchens — are consistently associated with higher inflammatory markers in research. They typically combine refined carbohydrates, industrial seed oils high in omega-6, added sugars, and various additives. The combination appears to be more harmful than any single ingredient.

Refined carbohydrates and added sugars cause repeated sharp spikes in blood glucose and insulin, which trigger inflammatory pathways. Over years, this pattern contributes to insulin resistance and metabolic dysfunction.

The ratio of omega-6 to omega-3 fatty acids matters significantly. Modern diets provide an omega-6 to omega-3 ratio of approximately 15:1 or higher; evolutionary estimates suggest we evolved on a ratio of 1:1 to 4:1. Omega-6 fats (prevalent in seed oils like corn, sunflower, soybean) are precursors to pro-inflammatory signalling molecules; omega-3s compete with and displace them.

• Ultra-processed foods: chips, packaged baked goods, fast food
• Refined grains: white bread, white rice, pastries, breakfast cereals
• Added sugars: sugary drinks, sweets, most packaged snacks
• Excessive refined seed oils: corn oil, soybean oil, sunflower oil (in large amounts)
• Alcohol in excess

Fatty fish (salmon, sardines, mackerel, anchovies, herring) are rich in EPA and DHA — the long-chain omega-3 fatty acids with the strongest anti-inflammatory evidence. Two to three servings per week provides meaningful benefit. Farmed salmon varies in omega-3 content depending on feed composition; wild-caught and quality farmed options are generally reliable.

Extra virgin olive oil contains oleocanthal, a polyphenol that works through similar pathways to ibuprofen. High-quality extra virgin olive oil (cold-pressed, ideally with a harvest date) also contains oleic acid and numerous other polyphenols. The 'extra virgin' designation and freshness matter — heat-extracted and old oils lose these compounds.

Deeply coloured vegetables and berries (blueberries, cherries, purple cabbage, red onion, spinach) are rich in anthocyanins and other polyphenols that consistently reduce inflammatory markers in clinical studies. Aim for variety across the colour spectrum.

• Fatty fish (salmon, sardines, mackerel): 2–3x per week
• Extra virgin olive oil: daily for cooking and dressing
• Leafy greens (spinach, kale, Swiss chard): daily
• Berries (blueberries, cherries, strawberries): daily or near-daily
• Nuts (especially walnuts, which are high in omega-3 ALA): daily handful
• Legumes (lentils, chickpeas, beans): several times per week
• Whole grains (oats, quinoa, barley): replace refined grains

Omega-3 fatty acids come in three main forms: ALA (alpha-linolenic acid) from plant sources like flaxseed, chia, walnuts, and hemp; and EPA and DHA from fatty fish and algae. ALA can be converted to EPA and DHA in the body, but conversion efficiency is low (typically less than 5–10% to EPA, less than 0.5% to DHA). Marine-sourced EPA and DHA are far more bioavailable.

For vegetarians and vegans, algal oil supplements provide preformed DHA and EPA directly — this is where fish get their omega-3s in the first place (by eating algae). Algal oil is an effective alternative to fish oil.

The evidence for omega-3 supplementation is strongest for those with existing cardiovascular risk factors and for those with very low dietary fish intake. For people eating two or more servings of fatty fish weekly, the additional benefit of supplementation is more modest.

Turmeric contains curcumin, which inhibits several inflammatory pathways. The challenge is bioavailability — curcumin is poorly absorbed from turmeric powder alone. Combining it with black pepper (which contains piperine) increases absorption by up to 2000%. Eating turmeric with fat also improves absorption. These culinary combinations are traditional in South Asian cooking for good reason.

Ginger contains gingerols and shogaols that inhibit the same COX enzymes as anti-inflammatory medications. Clinical trials show meaningful reductions in inflammatory markers and pain from regular consumption. Fresh ginger is more potent than dried.

Cinnamon has consistently shown effects on blood sugar regulation and inflammatory markers in clinical trials, particularly for people with insulin resistance. Ceylon cinnamon is preferred for large amounts as it contains less coumarin than the more common Cassia variety.