Is the Mediterranean Diet Anti-Inflammatory? What the Big Trials Measured

Why the question is trickier than it sounds

Look up an anti-inflammatory diet and the Mediterranean diet turns up on nearly every list of foods you find, but a spot on a list is not the same as a test.

Researchers track inflammation with blood markers. The main one is CRP (C-reactive protein), a protein your liver makes when inflammation is up. hs-CRP is a more sensitive test for the same protein. IL-6 is a signaling protein that helps drive the response.

So the real question is narrower: when people switch to a Mediterranean way of eating, do those numbers fall? That is something trials can measure. Many have.

Is the Mediterranean diet anti-inflammatory? What 33 trials found

The biggest recent answer came in 2026. A team pooled 33 randomized trials with 3,476 people. In a randomized trial, people are assigned to a diet by chance, which makes a fair comparison.1

Across 33 randomized trials, the Mediterranean diet lowered hs-CRP and IL-6. Standard CRP and TNF-alpha did not move.From a 2026 meta-analysis in Nutr Rev

Compared with a control diet, the Mediterranean diet lowered hs-CRP, IL-6 and IL-17, while standard CRP, TNF-alpha, IL-10 and total antioxidant capacity showed no significant change.1 Some signals calmed. Others did not.

An earlier review of 22 trials landed in the same place. Of all the eating patterns tested, the Mediterranean diet showed the clearest drops in IL-6 and IL-1 beta. The drop in CRP was about 1 mg/L, but the results varied so much from trial to trial that the estimate was shaky.3

Then came the widest view. A 2026 umbrella review, which is a review of reviews, gathered 30 reviews covering 225 studies and 15 eating patterns. The Mediterranean diet had a clear, helpful effect on CRP, IL-6 and adiponectin, a hormone from fat tissue that tends to be higher when inflammation is lower. The quality of that evidence ranged from high to low.2

Studies that simply compare people point the same way. In 5 snapshot studies of older adults, eating a more Mediterranean way was linked to lower CRP. Studies of other markers in older adults gave mixed results.10 Snapshot studies can show a link, but they cannot prove the diet did it.

What the PREDIMED trial measured

The PREDIMED trial in Spain tested two versions of the Mediterranean diet against advice to eat less fat.7 An early part of it checked blood markers in 772 people aged 55 to 80 at high risk of heart disease. One group got nutrition lessons plus free virgin olive oil, 1 liter a week. Another got lessons plus free nuts, 30 g a day.6 After 3 months, the olive oil group's CRP fell by 0.54 mg/L compared with the low-fat group. Both Mediterranean groups also saw better blood sugar and blood pressure.6 One catch: the low-fat group got less intense nutrition lessons than the Mediterranean groups.6

The full trial asked a bigger question. It followed 7,447 people for a median of 4.8 years. Heart attacks, strokes or heart deaths happened to 3.8% of the olive oil group, 3.4% of the nuts group and 4.4% of the control group.7

This trial has a history worth knowing. Its first report, from 2013, was withdrawn after the team found that some people had not been randomly assigned. The team reran the numbers without relying on that assumption, and the benefit held.7

Do heart patients see the same thing?

The CORDIOPREV trial in Spain tested this in 1,002 people who already had heart disease. They followed a Mediterranean diet or a low-fat diet for 7 years.8

Major heart events happened to 87 people in the Mediterranean group and 111 in the low-fat group. The benefit was clear in men. Among the 175 women, there was no difference between the diets.8

These heart trials measured heart events, not inflammation alone. They fit the marker data, but they do not prove the benefit came from calming inflammation.

Is the Mediterranean diet the same as an anti-inflammatory diet?

Not exactly. "Anti-inflammatory diet" is an idea, not a single plan. Researchers even built a scoring tool, the Dietary Inflammatory Index, that rates how likely a diet is to raise or lower inflammation. It was drawn from studies ranging from cells in a dish to human trials.9

When one 2022 review looked for trials of "anti-inflammatory diets", it screened 1,537 trials and kept 20. The Mediterranean diet was the one that produced clear, meaningful drops in many markers, including CRP, IL-6 and TNF-alpha, compared with a control diet.5

Other named diets have a thinner record. A 2024 review of 30 meta-analyses found the Mediterranean diet did the most to lower CRP, followed by vegetarian or vegan diets and eating fewer calories. Intermittent fasting, ketogenic, Nordic and paleo diets showed no such link.4 In the 22-trial review, the DASH diet and vegetarian or vegan diets showed no substantial effect.3

So the Mediterranean diet is the best-tested version of the anti-inflammatory idea, not the only way to eat well.

The bottom line

A liter of olive oil a week in Spain, a drop in hs-CRP across 33 trials, and fewer heart events in two long trials, each with an honest caveat attached. Some markers never moved. But no other eating pattern has been tested this often with this much agreement. If you want an anti-inflammatory diet with real trials behind it, start here.