Anti-Inflammatory Diet for Brain Health: What the Evidence Shows

By Peter Benson, Cognitive Enhancement Researcher  ·  Updated October 2026  ·  Citations re-verified

Short answer: An anti-inflammatory diet for brain health means a Mediterranean-style pattern: vegetables and leafy greens, olive oil, nuts, beans, fish and berries, with less ultra-processed food and alcohol. People who eat this way have lower dementia rates, but trials testing the diet directly have been mixed.

“Brain inflammation” has become a catch-all explanation for brain fog, low mood and memory decline, and diet is sold as the fix. Part of this is solid: chronic inflammation is involved in brain ageing, and people who eat a Mediterranean-style diet have lower rates of dementia. Part of it runs ahead of the evidence: few studies show that a particular food lowers inflammation in the human brain, and the best diet trials have produced mixed results.

This guide separates the two. It covers what neuroinflammation is, what the population studies and trials show, which foods have the best case, what to cut back, and my own way of eating, which is not the one the evidence supports best. It is part of the Brain Health & Longevity hub; for the wider picture, see how to prevent cognitive decline.

What neuroinflammation is, and what diet can and can’t do

The brain has its own immune cells, called microglia. They clear debris, prune connections and respond to injury or infection. Short bursts of inflammation are protective. Low-grade inflammation that persists for years is different: it is linked with faster cognitive ageing and is part of the disease process in Alzheimer’s disease.

Diet affects inflammation elsewhere in the body. Obesity, poorly controlled blood sugar and heavy drinking raise inflammatory markers in the blood, and the gut bacteria respond to what you eat. The step that is much less certain is the last one. Most evidence that specific foods calm the brain’s immune cells comes from cell and animal studies. In people, researchers usually measure blood markers such as C-reactive protein, or cognitive outcomes years later, not inflammation in the brain itself.

So the honest framing is practical rather than mechanistic. An anti-inflammatory diet is a dietary pattern associated with better brain ageing. Possible explanations include effects on the heart, blood vessels and blood sugar as well as on inflammation, and researchers have not established which of these accounts for the link. It is not a proven way to switch off brain inflammation.

The evidence for an anti-inflammatory diet and brain health

Population studies. In a cohort of 923 older adults followed for about 4.5 years, those whose diets most closely matched the MIND diet, a blend of the Mediterranean and DASH diets, had a 53% lower rate of Alzheimer’s disease than those with the lowest scores; moderate adherence was linked with a 35% lower rate (Morris et al., 2015). In a related study of 960 older adults, people who ate about one serving of leafy greens a day declined more slowly, by the equivalent of about 11 years of ageing, than those who ate almost none (Morris et al., 2018). These are strong associations, but people who eat this way also tend to differ in education, income, exercise and health, which the researchers could only partly adjust for.

Trials. In the PREDIMED study in Spain, 447 older adults at high cardiovascular risk were assigned to a Mediterranean diet with extra-virgin olive oil (about a litre a week), the same diet with 30g of nuts a day, or advice to cut fat. After about four years, the olive oil group had better global cognition scores than the control group, the nut group had better memory scores, and the control group declined (Valls-Pedret et al., 2015). The main PREDIMED trial was retracted and republished in 2018 because of problems with randomisation at some sites, which is worth knowing when reading results built on it.

The most direct test is the MIND diet trial: 604 older adults with excess weight and a less healthy diet were assigned to the MIND diet or their usual diet, both with mild calorie restriction, for three years. Cognition improved in both groups, and the difference between them was small and not statistically significant (Barnes et al., 2023). Possible reasons include the weight loss and dietary guidance both groups received, and three years being short for dementia prevention. The trial did not show that the MIND diet improved cognition more than the comparison; it doesn’t rule out benefits in other groups, over longer periods, or compared with a very different diet. The MIND diet guide covers the diet’s components and scoring.

Olive oil, fish, greens and fermented foods

Extra-virgin olive oil. It contains oleocanthal, a compound that blocks the same inflammatory enzymes as ibuprofen (Beauchamp et al., 2005). The comparison is often overstated: the researchers estimated that 50g of oil a day, about four tablespoons, would supply roughly a tenth of an adult ibuprofen dose, and oleocanthal content varies a lot between oils. The better reason to use olive oil is PREDIMED, where it was the fat in the group that did best.

Oily fish. The long-chain omega-3 fats in salmon, mackerel and sardines are involved in resolving inflammation (Calder, 2017), and fish eaters have lower dementia rates in population studies. Supplements are a different matter: a Cochrane review of three trials with over 3,500 cognitively healthy older adults found no benefit for cognition (Sydenham et al., 2012). Eating fish is part of a dietary pattern linked with better long-term health, while supplements have not consistently shown cognitive benefits in healthy older adults; neither body of evidence proves that fish itself is the cause. The omega-3 DHA guide covers the trials in detail.

Leafy greens, beans, nuts and berries. These are core MIND foods, and greens had the clearest link with slower decline in the Rush studies. The evidence is mostly observational; berries in particular rest more on animal and short-term studies than on long human trials.

Fermented foods and fibre. In a 10-week Stanford study of 36 healthy adults, a diet high in fermented foods such as yoghurt, kefir, kimchi and sauerkraut increased gut bacterial diversity and lowered 19 inflammatory proteins in the blood, including interleukin-6. The high-fibre group did not show the same response over those ten weeks (Wastyk et al., 2021), which doesn’t mean fibre lacks benefits. This is a small study of blood markers, not cognition or dementia, but it is one of the few randomised human studies linking a food change to lower inflammation. See the gut-brain connection.

What to cut back

Alcohol. The 2020 Lancet Commission on dementia counted drinking more than 21 UK units a week (about 168g of alcohol, or roughly 12 US standard drinks) as one of twelve modifiable risk factors (Livingston et al., 2020). Its 2024 update expanded the list to 14, adding high LDL cholesterol and untreated vision loss (Livingston et al., 2024). These findings support avoiding heavy drinking but don’t establish a safe threshold below which risk disappears, and starting to drink for brain health is not recommended.

Ultra-processed food and sugary drinks. Diets high in these are linked with higher inflammatory markers, weight gain and type 2 diabetes, and diabetes is itself a dementia risk factor. Most of the case for cutting them runs through these indirect routes rather than through direct evidence of brain inflammation.

What the evidence doesn’t single out. Claims that one ingredient, such as seed oils or nightshade vegetables, drives brain inflammation are not supported by human trials. The pattern matters more than any single food.

Anti-inflammatory foods ranked by evidence

🟢 Stronger or replicated evidence  ·  🟡 Limited, mixed or preliminary evidence  ·  🔴 Not established or not supported

Curcumin and turmeric

Curcumin, the main compound in turmeric, reduces inflammation in cell and animal studies but is poorly absorbed in its standard form. The best human result is a trial of 40 adults aged 50 to 90 without dementia: those taking an absorbable form (90mg twice a day) for 18 months did better on memory tests than those on placebo (Small et al., 2018). That is one small trial and needs repeating. Turmeric in normal food amounts is generally safe, but concentrated supplements are not risk-free. The NIH’s LiverTox database rates turmeric a well-documented cause of liver injury: rare, perhaps 1 in 10,000 to 100,000 users, but the most common cause of herbal-related liver injury in the US, with most cases linked to enhanced-absorption products made with black pepper extract or lipid carriers, the kind used in trials. Curcumin supplements can also interact with blood thinners and may be unsuitable for people with gallbladder disease. Stop and see a doctor if you develop dark urine, yellowing skin or eyes, or unusual tiredness.

A note on fasting

Fasting is often presented as anti-inflammatory, and I fast more than most people (see my notes below). The brain evidence in humans is thin; the intermittent fasting guide covers what exists. Longer fasts carry real costs. In a study of 12 healthy volunteers on a seven-day water-only fast, people lost an average of 5.7kg, including lean mass, most of which returned within three days of eating again, and about a third of the blood proteins measured changed, mostly after the third day (Pietzner et al., 2024). Those protein changes show the body adapting; they don’t show better brain health.

Multi-day fasting is not safe for everyone. Do not try it if you take medicines for diabetes or blood pressure, are pregnant or breastfeeding, are underweight, are under 18, or have a history of eating disorders, and talk to a doctor before any fast longer than a day or two. Without supervision, longer fasts can cause dehydration, electrolyte disturbances, low blood pressure and dangerous shifts when you start eating again (refeeding problems).

If you take an omega-3 supplement

Eat fish first if you can. If you eat little or none, check that the label states DHA and EPA separately and that the maker publishes third-party purity testing.

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