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Inflammatory Index: Definition & Dietary Tips

The inflammatory index rates how strongly foods or dietary patterns promote or inhibit inflammatory processes in the body. It helps assess nutrition-related inflammation risks.

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Things worth knowing about "Inflammatory index"

The inflammatory index rates how strongly foods or dietary patterns promote or inhibit inflammatory processes in the body. It helps assess nutrition-related inflammation risks.

What is the Inflammatory Index?

The inflammatory index – scientifically known as the Dietary Inflammatory Index (DII) – is a scoring system that quantifies the inflammatory potential of individual foods, nutrients, or overall dietary patterns. A positive index score indicates a pro-inflammatory effect, while a negative score reflects an anti-inflammatory effect. The concept was developed to help researchers and clinicians understand and measure the relationship between diet and chronic low-grade inflammation.

Background: Chronic Inflammation and Health

Chronic low-grade inflammation (also called “silent inflammation”) is increasingly recognized as a contributing factor to many widespread diseases, including:

Cardiovascular diseases
Type 2 diabetes
Metabolic syndrome
Certain types of cancer
Neurodegenerative conditions such as Alzheimer's disease
Chronic inflammatory bowel diseases (e.g., Crohn's disease, ulcerative colitis)

Diet plays a central role in this process, as specific nutrients and food components directly influence key inflammatory biomarkers such as C-reactive protein (CRP), interleukin-6 (IL-6), and tumor necrosis factor alpha (TNF-α).

How is the Inflammatory Index Calculated?

The DII is based on an extensive analysis of the scientific literature. More than 1,900 studies were reviewed to derive inflammatory scores for 45 dietary parameters, including individual nutrients, food groups, and bioactive compounds. Key parameters include:

Pro-inflammatory (positive score): Saturated fatty acids, trans fatty acids, refined sugars, white flour products, alcohol, sodium
Anti-inflammatory (negative score): Omega-3 fatty acids, dietary fiber, antioxidants (e.g., vitamin C, vitamin E, beta-carotene), polyphenols, curcumin, ginger, garlic, zinc, magnesium

An individual overall score is calculated by summing the weighted scores of all consumed food items and nutrients, taking intake amount and frequency into account.

Pro-Inflammatory and Anti-Inflammatory Foods

Pro-Inflammatory Foods

The following foods and dietary habits have been associated with increased inflammatory activity in the body:

Highly processed foods (fast food, ready meals)
Sugar-sweetened beverages and sweets
Red and processed meat
Trans fats (found in some margarines and baked goods)
Refined carbohydrates (white bread, refined pasta)
Excessive alcohol consumption

Anti-Inflammatory Foods

A diet with a low or negative DII score is typically rich in:

Vegetables and fruits (especially berries and cruciferous vegetables)
Fatty fish (salmon, mackerel, herring) as sources of omega-3 fatty acids
Legumes and whole grains
Olive oil (source of oleocanthal and monounsaturated fatty acids)
Nuts and seeds
Spices such as turmeric, ginger, and garlic
Green tea and coffee (in moderate amounts)

Clinical Relevance and Current Research

Numerous epidemiological studies have shown that a high (pro-inflammatory) DII score is associated with an increased risk of chronic diseases. The evidence is particularly strong for links between a high inflammatory index and:

Elevated CRP levels in the blood
Higher risk of cardiovascular disease
Poorer blood sugar management in type 2 diabetes
Higher body weight and obesity

The Mediterranean diet and the DASH diet (Dietary Approaches to Stop Hypertension) are among the dietary patterns with the lowest DII scores and are therefore considered especially beneficial for long-term health.

Practical Application in Daily Life

Although the precise calculation of the DII requires complex scientific methods, its core principles can easily be applied in everyday life. Those looking to lower their personal inflammatory index can take the following steps:

Eat more plant-based foods and fewer processed products
Consume fatty fish regularly or consider omega-3 supplements after consulting a doctor
Reduce sugar- and salt-heavy meals
Ensure adequate fiber intake (WHO recommendation: at least 25–30 g per day)
Prioritize foods rich in antioxidants

References

Shivappa N. et al. - Designing and developing a literature-derived, population-based dietary inflammatory index. Public Health Nutrition, 2014. DOI: 10.1017/S1368980013002115
Minihane A.M. et al. - Low-grade inflammation, diet composition and health: current research evidence and its translation. British Journal of Nutrition, 2015. DOI: 10.1017/S0007114515002093
World Health Organization (WHO) - Healthy diet fact sheet, 2020. Available at: https://www.who.int/news-room/fact-sheets/detail/healthy-diet

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