Colorful Mediterranean-style whole foods

Featured Healthy Eating Topic

Healthy Heart, Calmer Inflammation

What the Research Shows About Food, Inflammation, and Heart Health

Inflammation is not automatically a bad thing. It is one of the body’s normal defense systems. When you cut your finger, fight an infection, or recover from an injury, inflammation helps the body respond. The concern is different when inflammation becomes chronic and continues when it is no longer serving that short-term purpose. Researchers have found important connections between chronic inflammation, atherosclerosis (plaque buildup in artery walls), and cardiovascular disease (disease of the heart and blood vessels). They have also studied whether healthier dietary patterns are associated with changes in measurable inflammatory markers. This page looks at what the research actually found.

Inflammation Is Part of the Body’s Defense System

Inflammation is a normal biological response to injury, infection or tissue damage. Short-term inflammation can be useful: immune cells (the body’s defense cells) and chemical messages help coordinate a response.

Acute inflammation (a usually short-term response) is typically linked to a specific injury or challenge. Chronic inflammation (activity persisting over longer periods) may occur alongside chronic disease. Inflammation itself is not universally harmful.

  • A cut finger → inflammatory response → healing.
  • An infection → immune response → recovery.
  • Exercise → short-term tissue response → repair.
Immune cells responding to a small skin injury
A short-term defense response helps the body heal. Educational illustration.

Short term · acute

  • Helpful response to a specific challenge
  • Temporary
  • Usually resolves

Long term · chronic

  • May persist
  • Can occur alongside chronic disease
  • Associated with cardiovascular disease and other conditions
Immune cells and signaling molecules in tissue
Persistent immune activity is a complex process. Educational illustration.

What Does Inflammation Have to Do With the Heart?

Cardiovascular disease is not simply “fat clogging a pipe.” Atherosclerosis (plaque buildup in artery walls) involves cholesterol-containing particles, artery-wall changes, immune cells, inflammatory signaling (chemical messages between cells) and plaque formation.

The American Heart Association explains that plaque can trigger an immune response that sends inflammatory cells to the area. Chronic inflammatory activity is involved in this biology. Researchers continue to study plaque development, plaque instability (a plaque becoming more likely to rupture), and cardiovascular events (such as heart attack or stroke).

Inflammation alone does not cause every heart attack. These pictures simplify biology; they do not show a person’s diagnosis.

  • Healthy artery → cholesterol-containing material enters the artery wall → immune response → developing plaque → more complex plaque.
Heart and connected blood vessels
Educational illustration — not a diagnostic image.
Open artery cross section
Simplified healthy artery. Educational illustration — not a diagnostic image.
Arterial wall with plaque and immune cells
Plaque develops within the artery wall, not simply as fat in a pipe. Educational illustration.
Immune cells near lipid material in a plaque
Immune cells are involved in plaque biology. Educational illustration.

How Do Researchers Measure Inflammation?

Inflammation is not one single number. Researchers commonly measure biomarkers (measurable biological signals) in blood. Some reflect activity throughout the body; others are signaling proteins involved in immune pathways.

A single marker does not tell the entire story of a person’s health. These are research and clinical measurements, not a home-diagnosis guide. Values can vary with infections, injuries and other conditions. Interpretation belongs in the context of personal medical care.

    Proteins and red blood cells in a blood vessel
    Conceptual biomarkers — not test results or a diagnostic image.

    hs-CRP

    High-sensitivity C-reactive protein

    A blood marker commonly used in cardiovascular research to reflect systemic inflammatory activity (inflammation-related activity throughout the body).

    IL-6

    Interleukin-6

    A signaling protein involved in immune and inflammatory responses.

    TNF-α

    Tumor necrosis factor alpha

    Another inflammatory signaling molecule frequently studied in research.

    IL-1β

    Interleukin-1 beta

    A signaling molecule involved in inflammatory pathways.

    What Published Research Has Found

    Different populations, comparisons and outcomes — not interchangeable results or promises for an individual.

    Dietary research 1

    Mediterranean Diet and Inflammatory Markers

    2026 · Keshani et al., Nutrition Reviews

    3,476 participants

    33 randomized trials

    Systematic review and meta-analysis (a structured review pooling trial results) of 33 randomized controlled trials involving 3,476 participants. Mediterranean dietary interventions were compared with control diets.

    Statistically significant pooled reductions

    hs-CRP ↓ · IL-6 ↓ · IL-17 ↓

    No statistically significant overall effect

    Standard CRP · IL-10 · TNF-α · total antioxidant capacity

    Significant pooled reductions

    • hs-CRP
    • IL-6
    • IL-17

    Not significant overall

    • CRP
    • IL-10
    • TNF-α
    • total antioxidant capacity

    Mediterranean-style eating can improve some measurable markers, but it does not uniformly lower every inflammatory marker.

    Statistical significance (a finding unlikely to be explained by chance alone under the study model) does not imply the same individual response. Standard CRP and hs-CRP refer to different assay sensitivity; keep the reported outcomes separate.

    Study source · PMID 41211687

    Dietary research 2

    Three Years of Mediterranean-Style Eating

    2021 · Casas et al., PREDIMED biomarker analysis

    285 participants

    285 adults at high cardiovascular risk were assigned to Mediterranean diet + extra-virgin olive oil, Mediterranean diet + nuts, or a low-fat comparison diet. Biomarkers were measured over three years.

    Mediterranean + extra-virgin olive oil

    Within-group decreases in 10 of 14 measured plasma markers.

    Mediterranean + nuts

    Within-group decreases in 10 of 14 measured plasma markers.

    Compared with low-fat diet

    Changes differed significantly for IL-1β, IL-6, IL-8 and TNF-α.

    Mediterranean patterns were associated with measurable differences in selected inflammatory biomarkers compared with the comparison diet.

    Within-group decreases included IL-1β, IL-6, IL-8, TNF-α, IFN-γ, hs-CRP, MCP-1, MIP-1β, RANTES and ENA78. Do not present all ten as significant between-diet effects. This is a selected high-risk PREDIMED population, not a general-population guarantee.

    Study source · PMID 34440065

    Dietary research 3

    Inflammatory Markers at 3 and 5 Years

    2016 · Long-term PREDIMED analysis

    165 participants

    165 adults at high cardiovascular risk, without overt cardiovascular disease (clinically evident disease), were assigned to Mediterranean diet + olive oil, Mediterranean diet + nuts, or low-fat diet. Follow-up was at three and five years.

    Mediterranean + olive oil

    At least 16% lower concentrations versus baseline for hs-CRP, IL-6, TNF-α and MCP-1.

    Reported minimum reduction versus baseline — not overall inflammation.

    Mediterranean + nuts

    At least 16% lower concentrations versus baseline for the same markers.

    Reported minimum reduction versus baseline — not overall inflammation.

    Low-fat comparison

    No significant within-group change for these markers reported.

    Reported minimum biomarker decrease from baseline

    Both Mediterranean groups · at 3 and 5 years · hs-CRP, IL-6, TNF-α, MCP-1

    16%

    At least 16% lower concentrations; not overall inflammation or heart-attack risk.

    Both Mediterranean groups showed significant reductions from baseline at three and five years in several plasma inflammatory markers.

    This is NOT “16% less inflammation,” a universal health score, or a 16% reduction in heart attacks. The percentage refers to selected biomarker concentrations compared with baseline (the starting measurement), not a single between-diet effect. These PREDIMED analyses are not independent new parent trials.

    Study source · PMID 27440261

    Medication trial — NOT a diet study

    Inflammation Is More Than a Laboratory Curiosity

    2020 · CANTOS total cardiovascular event analysis

    10,061 participants

    CANTOS tested canakinumab (a targeted anti-inflammatory medication), NOT DIET, in 10,061 people with prior myocardial infarction (heart attack) and elevated hs-CRP. Median follow-up was 3.7 years.

    Placebo

    10.4 serious cardiovascular events per 100 person-years.

    Canakinumab 50 mg

    8.4 events per 100 person-years.

    Canakinumab 150 mg

    8.3 events per 100 person-years.

    Canakinumab 300 mg

    8.2 events per 100 person-years.

    Total serious cardiovascular events per 100 person-years

    Medication trial; includes first and repeat events. Scale starts at zero.

    Placebo10.4
    10.4
    Canakinumab 50 mg8.4
    8.4
    Canakinumab 150 mg8.3
    8.3
    Canakinumab 300 mg8.2
    8.2

    Targeting an inflammatory pathway reduced the total burden of serious cardiovascular events compared with placebo in this selected population. It supports the biological relevance of inflammation, not a dietary treatment claim.

    This analysis counted first AND repeat events: 3,417 total events in 2,003 people. The composite included myocardial infarction, stroke, coronary revascularization (procedures to restore blood flow to the heart), and cardiovascular death. Person-years combine people and time; these rates are not percentages of people. Medication has risks, including infection concerns; no treatment recommendation is made.

    Study source · PMID 33004131

    What the Research Shows at a Glance

    StudyInterventionResultImportant context
    Mediterranean Diet and Inflammatory MarkersMediterranean dietary patternsSome markers improved — not all3,476 participants / 33 randomized trials · Biomarker outcomes
    Three Years of Mediterranean-Style EatingMediterranean dietary patterns4 markers differed from the comparison diet285 participants · Biomarker outcomes
    Inflammatory Markers at 3 and 5 YearsMediterranean dietary patterns≥16% lower for several measured markers165 participants · Biomarker outcomes
    Inflammation Is More Than a Laboratory CuriosityAnti-inflammatory medication — NOT dietLower total serious cardiovascular event rates10,061 participants · Total cardiovascular events

    What the Evidence Means — and What It Doesn’t

    What the research supports

    • Chronic inflammation is involved in cardiovascular disease biology.
    • Healthy dietary patterns can influence some inflammatory biomarkers.
    • Mediterranean patterns have some of the strongest dietary evidence.
    • Overall pattern matters more than searching for one “anti-inflammatory” food.
    • Cardiovascular health depends on many interacting factors.

    What the research does not prove

    • One food does not eliminate inflammation.
    • Everyone will not have the same response.
    • Inflammation is not the only cause of cardiovascular disease.
    • Diet should not replace prescribed medication.
    • Lowering one biomarker does not guarantee prevention of a heart attack.
    • “Anti-inflammatory” supplements are not established substitutes for healthy dietary patterns.

    What the Research-Based Pattern Actually Looks Like

    The underlying principles work across many cuisines. You do not need one exact Mediterranean menu. AHA’s 2026 guidance emphasizes an overall pattern: vegetables, fruit, whole grains, healthy protein sources, unsaturated fats in place of saturated fats, minimally processed foods, and less added sugar and sodium.

    • Vegetables: leafy greens, peppers, tomatoes, broccoli, carrots and squash.
    • Fruit: berries, citrus, apples and pears.
    • Legumes (beans, lentils and chickpeas): flexible plant-protein choices.
    • Whole grains: oats, barley, quinoa, brown rice and whole-grain breads.
    • Unsaturated fat sources: olive oil, nuts, seeds and avocado.
    • Protein sources: fish, beans, lentils and poultry where appropriate.
    • Herbs and spices: garlic, ginger and favorite seasonings.
    Vegetables fruit legumes and whole grains
    Color and variety can fit many cuisines.

    More Often / Less Often

    More Often

    • Vegetables
    • Fruit
    • Beans and lentils
    • Whole grains
    • Nuts and seeds
    • Fish
    • Olive oil and other unsaturated fat sources
    • Minimally processed foods

    Less Often

    • Heavily processed meats
    • Heavily refined snack foods
    • Foods high in added sugars
    • Foods high in saturated fat
    • Frequent high-sodium convenience meals
    • Sugar-sweetened beverages

    Why Food Processing Matters

    Food processing exists on a spectrum. Not all processed food is unhealthy: frozen vegetables, canned beans, plain yogurt, whole-grain bread and canned fish can be useful choices.

    The concern is frequent reliance on highly or ultra-processed foods (industrial formulations that often include ingredients uncommon in home cooking) that may contain more sodium, added sugars, refined starches or saturated fat. Not every item has the same nutrient profile.

    AHA’s 2026 guidance favors minimally processed foods over ultra-processed foods. Check the actual nutrients and the overall pattern rather than treating all packaged food as harmful.

      Convenience foods beside a chickpea vegetable grain meal
      Choices differ in nutrients and overall pattern; packaging alone is not a verdict.

      One Superfood — or a Consistent Healthy Pattern?

      MYTH: “There must be one food that fights inflammation.”

      REALITY: Research generally studies overall dietary patterns. Berries, olive oil, nuts, vegetables, fish, whole grains and beans may be part of those patterns. No single food is a cure or treatment.

      A consistent collection of choices matters more than a superfood headline. Supplements marketed as “anti-inflammatory” are not interchangeable with the dietary interventions studied here.

        Fresh herbs garlic ginger citrus and spices
        Flavor across cuisines, without a cure or supplement claim.

        Does Sugar Cause Inflammation?

        Added sugars can contribute to poorer overall diet quality and excess calorie intake. Current heart-health guidance limits foods and beverages high in added sugars.

        That does not mean sugar directly inflames your arteries every time you eat it. Patterns high in added sugars and highly processed foods are generally less aligned with heart-healthy recommendations. Keep the focus on the overall pattern, not fear of an isolated bite.

          Grocery basket with produce canned beans and frozen vegetables
          Useful packaged foods can be part of a healthier pattern.

          What About Saturated Fat?

          AHA guidance favors replacing some sources of saturated fat (the fat common in butter and fatty processed meats) with unsaturated fats (the fats common in olive oil, nuts, seeds, fish and avocado).

          Teach substitution rather than elimination: instead of frequent butter or fatty processed meats, use olive oil or include nuts, seeds, fish and avocado more often. Fat itself is not universally inflammatory.

            Olive oil nuts seeds and avocado
            Substitute unsaturated fat sources for some saturated fat sources.

            Fiber Is One Reason Whole Foods Matter

            Heart-healthy patterns tend to be rich in fiber (the part of plant foods that supports digestion). Beans, lentils, vegetables, fruit, whole grains, nuts and seeds bring fiber along with other nutrients.

            These foods can help build fuller meals and support overall diet quality. Fiber alone does not “remove inflammation.”

              Oats barley quinoa brown rice bread and beans
              Fiber-rich foods bring variety and help build fuller meals.

              What Could This Look Like on Your Plate?

              Illustrative meal ideas, not the trial menus or a personal treatment plan.

              Plain yogurt with berries walnuts and oats
              Breakfast idea: oatmeal, berries, walnuts and plain yogurt.

              Breakfast

              Oatmeal, berries, walnuts and plain yogurt.

              Chickpea whole grain bowl with greens and lemon
              Lunch idea: chickpeas, tomatoes, greens and a lemon–olive oil dressing.

              Lunch

              A whole-grain bowl with chickpeas, tomatoes, greens, olive oil and lemon.

              Salmon with vegetables and brown rice
              Dinner idea: fish, colorful vegetables and a whole grain.

              Dinner

              Grilled salmon, roasted vegetables, brown rice or quinoa.

              Apple slices with unsalted nuts
              Snack idea: an apple and unsalted nuts.

              Snack

              An apple and unsalted nuts.

              Bean and lentil vegetable bowl
              Plant-based dinner idea: lentils, vegetables, whole grains and herbs.

              Plant-based dinner

              Lentils, roasted vegetables, a whole grain and fresh herbs.

              Explore Recipes

              Seven Everyday Shifts

              Choose an achievable change, not a strict diet plan. Repeatable choices can be more useful than trying to change everything at once.

              • Add another vegetable.
              • Choose whole grains more often.
              • Use beans and lentils regularly.
              • Replace some saturated fats with unsaturated fats.
              • Include nuts and seeds in sensible portions.
              • Choose minimally processed foods more often.
              • Reduce frequent foods high in sodium and added sugars.
              Preparing vegetable and chickpea grain bowls
              Small repeatable choices can make a pattern easier to sustain.

              Inflammation Isn’t Only About Food

              Inflammatory and cardiovascular health can be influenced by many factors. A person’s inflammation is not simply caused by what they eat. Medical conditions, circumstances and genetics matter too.

              • Smoking, physical inactivity and excess body weight.
              • Diabetes, high blood pressure and cholesterol levels.
              • Sleep, infections and autoimmune conditions (conditions in which the immune system attacks the body’s own tissues).
              • Genetics and other medical conditions.

              Key Takeaways

              • Inflammation is a normal part of the body’s defense system.
              • Chronic inflammation is involved in cardiovascular disease biology.
              • Researchers measure several different biomarkers, not one inflammation score.
              • Mediterranean dietary patterns improved some markers in randomized studies.
              • Not every inflammatory marker improves in every study.
              • Overall pattern matters more than a single “anti-inflammatory” food.
              • Healthy eating is one part of the larger cardiovascular-health picture.

              Scientific References

              Research sources checked 2026-10-25 · General education, not a claim of professional medical review.

              1. American Heart Association: Inflammation and Heart Disease
              2. American Heart Association: 2026 Dietary Guidance to Improve Cardiovascular Health
              3. 2026 · Keshani et al., Nutrition Reviews · Mediterranean Diet and Inflammatory Markers · PMID 41211687
              4. 2021 · Casas et al., PREDIMED biomarker analysis · Three Years of Mediterranean-Style Eating · PMID 34440065
              5. 2016 · Long-term PREDIMED analysis · Inflammatory Markers at 3 and 5 Years · PMID 27440261
              6. 2020 · CANTOS total cardiovascular event analysis · Inflammation Is More Than a Laboratory Curiosity · PMID 33004131
              7. Original CANTOS trial: Antiinflammatory Therapy with Canakinumab for Atherosclerotic Disease (2017)

              Explore Related Healthy Eating Topics

              Inflammation is far more complicated than a list of foods to eat or avoid. What the research does show is that consistent, heart-healthy eating patterns can be associated with measurable improvements in several important inflammatory markers. You don’t need one miracle food. A collection of better everyday choices can create a healthier overall pattern. Healthy Heart Choices is here to help make those choices easier, one meal at a time.