Anti-Inflammatory Diet

A label attached to several programs

The phrase anti-inflammatory diet has been attached to more than one program. One is the Zone Diet of Barry Sears, which a 2004 review co-written by Sears describes as built on the idea that the hormonal responses to macronutrients, in particular the insulin and glucagon axis and eicosanoids, could be managed to control inflammatory responses. Because the review is by the diet's originator, it documents the stated rationale of the diet rather than an independent assessment of it. The sources reviewed for this page do not confirm the year of the first Zone Diet book.

Public discussion also refers to a food pyramid associated with Andrew Weil. The page describing it could not be opened for this review, and no peer-reviewed or professional-body source describing its origin was found, so this page does not date or describe it.

A research index of dietary inflammation

In research, the term is tied to the Dietary Inflammatory Index (DII), reported by Shivappa, Steck and colleagues in Public Health Nutrition (published online in 2013 and in print in 2014). The authors screened about 6,500 articles published through December 2010 on the effect of dietary parameters on six inflammatory markers (IL-1 beta, IL-4, IL-6, IL-10, TNF-alpha and C-reactive protein), and read and scored 1,943 qualifying articles across 45 food parameters. Intakes were compared with those in eleven food consumption data sets from around the world, giving scores from about +7.98 (maximally pro-inflammatory) to -8.87 (maximally anti-inflammatory), with a median of +0.23.

Named programs in bowel disease

In inflammatory bowel disease (IBD), a 2026 perspective lists the IBD-Anti-Inflammatory Diet (IBD-AID) and the Groningen Anti-Inflammatory Diet (GrAID) among the strategies it reviews, alongside the Mediterranean diet, the Specific Carbohydrate Diet and the low-FODMAP diet. Its authors describe anti-inflammatory dietary patterns as proposed adjuncts to drug treatment, and note that the evidence is limited by heterogeneous studies and small cohorts.

One label, several meanings

Reviews use the term loosely. A 2025 umbrella review of rheumatoid arthritis (RA) treats anti-inflammatory diets as one category among nutritional interventions, while a 2021 meta-analysis defined potentially anti-inflammatory diets as Mediterranean, vegetarian, vegan and ketogenic diets. A 2025 review of arthritis trials lists vegan, anti-inflammatory and Mediterranean diets as separate interventions. Results for one pattern therefore cannot be assigned to another.

Dietary inflammatory potential and a diet followed on purpose

A DII score describes the inflammatory potential of the diet a person reports eating, calculated against global reference intakes. It is a research measure applied to dietary data and is not itself a plan that anyone follows. Reviews of the index speak of pro-inflammatory dietary patterns, meaning high-scoring diets, which is a different question from whether deliberately changing diet lowers disease risk or symptoms.

Related Machipedia pages

On Machipedia, this page is a member of the family page Dietary Approaches, which covers dietary patterns as a group. Mediterranean Diet has its own page, and the reviewed literature treats it as a separate pattern that overlaps with this one. Autoimmune Protocol Diet and Plant-Based Diet are likewise separate pages; a 2026 narrative review of IBD trials lists the Autoimmune Protocol Diet and the Mediterranean diet as distinct interventions next to a single trial of an anti-inflammatory diet.

General features in outline

Sources describe the diet as an overall eating pattern rather than a treatment. The Arthritis Foundation presents an anti-inflammatory diet, with the Mediterranean diet as its example, as one that may help reduce inflammation throughout the body, while stating that no specific diet is required for people with inflammatory forms of arthritis. Crohn's & Colitis UK describes the anti-inflammatory diet for IBD as loosely based on the Specific Carbohydrate Diet with fewer restrictions, and as including probiotics and natural prebiotics intended to encourage gut-friendly bacteria.

No single protocol

The reviewed sources do not describe one standard protocol or a required practitioner credential for the label. A 2025 systematic review of 49 arthritis trials could not run a meta-analysis because study designs, interventions and outcomes were too varied. A 2026 narrative review concluded that, because the various diets are complex, dietitians with expertise in IBD are needed to help manage them. This page gives no food lists or plans.

Overlap with Mediterranean eating

Guidance and research frequently treat the two as close relatives. NICE's rheumatoid arthritis guideline says people who want to experiment with diet can be encouraged to follow Mediterranean diet principles, while telling them there is no strong evidence that their arthritis will improve. A 2025 review of autoimmune disease studied adherence to the Mediterranean diet, which it describes as having anti-inflammatory properties, and a 2025 meta-analysis pooled anti-inflammatory and Mediterranean patterns as separate strata.

What sources describe as the aim

Sears and Bell describe their anti-inflammatory approach as aimed at inflammatory responses in conditions such as obesity, type 2 diabetes and cardiovascular disease. The Arthritis Foundation describes the aim as reducing body-wide inflammation, and Crohn's & Colitis UK describes the IBD version as intended to encourage gut-friendly bacteria and reduce inflammation. Authors of the 2026 IBD perspective describe anti-inflammatory patterns as proposed adjuncts that might help induce and maintain remission alongside drug treatment. These are stated aims, not established effects.

Prevention framing

An umbrella review of 90 systematic reviews of the DII concluded that diets with a high inflammatory load may represent a significant health risk factor and argued for preventive interventions promoting anti-inflammatory dietary patterns, while also calling for randomized trials to confirm benefits.

Cohort and case-control studies using the index

A 2021 umbrella review of 15 meta-analyses covering 38 outcomes and more than four million participants found that higher (more pro-inflammatory) DII scores were nominally associated with 27 outcomes, but convincing evidence applied to myocardial infarction only, and most outcomes had suggestive or weaker evidence. Another 2021 umbrella review of 35 meta-analyses reported highly suggestive harmful associations for several cancers and cardiovascular mortality, and called for trials to learn whether the associations are causal. A 2026 umbrella review of 90 reviews rated most as low or critically low in methodological quality.

Rheumatoid arthritis

A 2025 meta-analysis of 12 observational studies found that anti-inflammatory dietary patterns were associated with lower odds of later RA (odds ratio 0.56, 95% CI 0.31 to 0.99); heterogeneity across the pooled healthy patterns was high (I-squared 81%). For people who already have RA, a 2021 meta-analysis pooled seven randomized trials (326 participants) and found 9.22 mm lower pain on a 10 cm scale with potentially anti-inflammatory diets than with ordinary diets, but all studies had a high risk of bias and the authors rated the evidence as very low. A 2025 umbrella review rated the quality of evidence for anti-inflammatory diets and other interventions as low to very low. A 2025 review of 49 trials reported improvements with vegan, anti-inflammatory and Mediterranean diets, as adjuncts to drug treatment, and called for further high-quality trials.

Bowel disease and other conditions

A 2025 meta-analysis of six randomized trials (359 patients) of anti-inflammatory diets in ulcerative colitis found no significant effect on remission or relapse in quiescent disease, a higher clinical response in active disease (risk ratio 1.82, 95% CI 1.20 to 2.75) and lower fecal calprotectin. A 2026 narrative review found that the one anti-inflammatory diet trial and the two Mediterranean diet trials did not significantly improve quality of life in IBD. For osteoarthritis, searches of PubMed for reviews of anti-inflammatory diets did not return a review that this page could verify as testing a defined anti-inflammatory diet, so the sources reviewed do not cover it.

Markers are not the same as clinical benefit

The index was built from studies of inflammatory markers, so it measures a laboratory proxy. A 2025 review of Mediterranean eating in autoimmune disease found reductions in C-reactive protein in some studies but described the findings as inconsistent and of low certainty. In ulcerative colitis, the meta-analysis found lower fecal calprotectin alongside no significant change in remission or relapse in quiescent disease. The sources reviewed do not show that a change in a marker translates into symptom control or fewer complications.

Certainty, bias and a split between guidance and trials

Positive trial summaries sit beside cautious guidance. The Arthritis Foundation says that no specific diet is required in inflammatory arthritis, NICE says there is no strong evidence that diet improves RA, and Crohn's & Colitis UK says there is not enough evidence to recommend the anti-inflammatory diet for IBD. The 2025 umbrella review authors themselves describe the low quality of the evidence as a reason for further research.

Not a replacement for disease treatment

Crohn's & Colitis UK states that there is no evidence that following a particular diet can eliminate Crohn's disease or colitis, and that claims otherwise are unsupported. It advises speaking to a doctor, IBD team or dietitian before making big dietary changes. The Arthritis Foundation does not present diet as replacing arthritis medication, and the 2025 ulcerative colitis meta-analysis describes anti-inflammatory diets as complementing conventional therapy. Dietary changes should not delay or replace necessary medical care.

Restriction, nutrition and eating disorders

Crohn's & Colitis UK says experts do not recommend completely cutting out particular foods or food groups, because important nutrients can be missed, and that people with IBD already have a higher risk of malnutrition. A 2026 narrative review of eating disorders in gastrointestinal disease reports that chronic symptoms often prompt dietary modification that can inadvertently trigger or mask pathological restrictive eating, and describes orthorexia nervosa, a preoccupation with healthy eating, as a proposed construct. It recommends distinguishing necessary restriction from pathological patterns, with gastroenterologists, psychiatrists and dietitians working together.

Medicines, alcohol and professional guidance

The Arthritis Foundation advises people with RA to limit alcohol, particularly with medicines such as methotrexate, and notes that corticosteroids can cause sodium retention. In the United Kingdom, the British Dietetic Association states that the title dietitian is protected and requires registration with the Health and Care Professions Council after an accredited degree, whereas terms such as nutritionist and diet expert are not regulated. The sources reviewed describe no similar standard for the anti-inflammatory diet label itself, and do not address pregnancy, children or kidney disease.