Research note · November 3, 2026
The Mediterranean diet lowered three inflammation markers across 33 clinical trials
A meta-analysis published in September 2026 pooled 33 randomized trials with 3,476 adults. On a Mediterranean diet, hs-CRP, IL-6 and IL-17 went down. Four other markers did not move.
What was studied
Researchers reviewed every randomized trial published up to July 2024 that compared a Mediterranean diet with a control diet and measured blood markers of inflammation and oxidative stress. They found 33 that met the criteria, with 3,476 participants in total, and combined their results.
A randomized trial is the design that lets the change be attributed to the diet and not to something else, because chance decides who follows it. A meta-analysis of 33 of them carries more weight than any single study.
What it found
Three markers fell significantly on the Mediterranean diet compared with the control diet: high-sensitivity C-reactive protein (hs-CRP), interleukin 6 (IL-6) and interleukin 17 (IL-17).
Four did not change significantly: standard C-reactive protein, interleukin 10, tumor necrosis factor alpha and total antioxidant capacity.
The effect on IL-6 was clearest in people under 60, in interventions shorter than 12 weeks, and in people with cardiovascular disease.
What it means for you
Chronic low-grade inflammation is one of the twelve hallmarks of aging: an alert state of the immune system that does not switch off and that travels with cardiovascular disease, diabetes and neurological decline. hs-CRP and IL-6 are two of the most common ways to measure it in blood.
This analysis indicates that the way you eat moves those markers under controlled conditions. It adds to what the PREDIMED trial already showed in 7,447 people: about 30% fewer heart attacks, strokes and cardiovascular deaths on a Mediterranean diet.
What it does not say
It measured blood markers, not disease or lifespan. A marker going down is a signal, and on its own it does not guarantee a person gets sick less.
The authors themselves call for more high-quality studies to confirm the finding. And not every marker responded: standard CRP and tumor necrosis factor did not change.
How it connects to BMC
In the functional nutrition consultation, the eating plan is built on your lab work and your real routine. Markers like hs-CRP are measured with a blood sample: ask in your evaluation whether it makes sense to include them in your case, and to measure them before and after the change in diet.
The source
Original abstract read on October 3, 2026.
Keshani M, et al. Mediterranean Diet Reduces Inflammation in Adults: A Systematic Review and Meta-analysis of Randomized Controlled Trials. Nutrition Reviews. 2026 Sep 1.
Does this apply to you?
A study says what happens on average. What makes sense for you comes out of the evaluation, with your history and your lab work.
