Dietary Inflammation and Long-Term Health
Summary ID02-HA-RS-00050
Research Summary
Original Publication
The association of dietary inflammation index (DII) and health-related outcomes: An umbrella review of systematic reviews.
Journal
Clinical Nutrition ESPEN, .
- Category
- 02Healthy Aging
- Evidence
- Umbrella Review of Systematic Reviews and Meta-Analyses
- Summary Type
- Latest
What Was Studied?
Chronic low-grade inflammation is involved in the development of many chronic diseases.
Diet is one of the modifiable factors that may influence inflammatory processes. Researchers have therefore developed methods to estimate the inflammatory potential of the overall diet.
One of the most widely studied is the Dietary Inflammatory Index (DII).
The DII is not a blood test. It is a dietary score designed to estimate how pro-inflammatory or anti-inflammatory an overall dietary pattern may be.
The index incorporates more than 45 dietary factors, including nutrients, food components and bioactive compounds. Higher DII scores indicate a more pro-inflammatory dietary pattern and have been associated with higher levels of inflammatory biomarkers, including C-reactive protein, interleukin-6 and tumor necrosis factor-alpha.
This 2026 umbrella review examined the accumulated evidence linking DII scores with health outcomes.
The researchers identified 90 systematic reviews and/or meta-analyses published up to July 2024. These covered a broad range of outcomes, including cancer, mortality, metabolic and cardiovascular disease, mental and neurocognitive health, body composition and bone health.
The findings were synthesized narratively. The methodological quality of the included reviews was assessed using AMSTAR 2.
Key Findings
Higher dietary inflammatory scores were associated with less favorable health outcomes.
Across the accumulated evidence, higher DII scores were associated with adverse outcomes across multiple areas of health.
Associations were reported for cardiovascular and metabolic disease, several cancers, mortality and neurocognitive and mental health outcomes.
The findings suggest that the inflammatory potential of the overall dietary pattern may be relevant to long-term health.
The findings relate to the overall dietary pattern, not individual foods.
The DII estimates the inflammatory potential of the overall diet using information from multiple dietary components.
This is an important distinction.
The findings do not demonstrate that individual foods can simply be classified as causing or preventing inflammation.
Instead, they support examining the combined dietary pattern and how its components interact over time.
The amount of research is greater than the certainty of the evidence.
Despite the large number of systematic reviews and meta-analyses, most were rated as having low or critically low methodological quality using AMSTAR 2.
The authors therefore concluded that the overall certainty of evidence remains limited.
They called for randomized controlled trials to determine whether changing toward a less inflammatory dietary pattern directly improves health outcomes.
Why It Matters for Longevity
Chronic low-grade inflammation is associated with many diseases that can reduce healthspan.
Diet may influence inflammatory pathways over time. The accumulated evidence suggests that dietary patterns with greater inflammatory potential are associated with less favorable long-term health outcomes.
However, the concept should not be reduced to lists of individual “inflammatory” and “anti-inflammatory” foods.
Foods are consumed as part of complex dietary patterns. Their nutrients and bioactive compounds interact with one another and with the wider metabolic environment.
For longevity medicine, the overall dietary pattern is therefore more informative than focusing on a single food or nutrient.
Clinical Perspective
This umbrella review provides a broad and updated overview of the evidence surrounding dietary inflammatory potential.
Its principal strength is its scope. The researchers evaluated 90 systematic reviews and meta-analyses, used independent investigators for study selection, data extraction and critical appraisal, and assessed methodological quality using AMSTAR 2. The protocol was prospectively registered in PROSPERO.
However, the findings require careful interpretation.
The review used a narrative synthesis rather than performing a new pooled meta-analysis across all health outcomes. More importantly, most of the included reviews were assessed as having low or critically low methodological quality.
Much of the underlying evidence is also observational. Diet is closely associated with physical activity, smoking, body weight, socioeconomic factors and other health behaviors. Residual confounding therefore remains possible.
The DII should also be understood as a research instrument. It estimates the inflammatory potential of dietary intake. It does not diagnose chronic inflammation in an individual.
The evidence supports an association between dietary inflammatory potential and multiple health outcomes. It does not yet establish that deliberately lowering a DII score prevents chronic disease or extends lifespan.
Key Takeaway
Diets with greater inflammatory potential are associated with less favorable health outcomes. However, current evidence does not yet establish whether reducing the inflammatory potential of the diet directly prevents disease.
Reviewed and Summarized by
Source Publication
- Title:
- The association of dietary inflammation index (DII) and health-related outcomes: An umbrella review of systematic reviews.
- Authors:
- Gkesou V, Theodoridis X, et al.
- Journal:
- Clinical Nutrition ESPEN, October 2026.
