Inflammation is usually described as something bad, but that is only half the story. Short-term inflammation is an essential part of the immune response, helping the body react to infections, injuries, and other threats.
The concern is chronic low-grade inflammation – a quieter form of immune activation that can remain elevated over long periods.
Researchers often study biomarkers such as C-reactive protein (CRP), high-sensitivity CRP, interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) to understand these processes.
Diet is one factor that may influence these markers.
Research on dietary patterns and chronic inflammatory markers suggests that overall eating habits can matter more than individual “anti-inflammatory” foods.
Mediterranean-style, vegetarian, DASH, and other nutrient-rich patterns have been studied for their potential effects, while dietary patterns high in heavily processed foods are frequently associated with less favorable inflammatory profiles.
The important word, however, is patterns. One blueberry smoothie will not cancel months of poor dietary habits.
What Are Chronic Inflammatory Markers?
Inflammatory markers are measurable substances that can increase when immune and inflammatory pathways become active.
CRP is one of the most commonly measured. It is produced mainly by the liver in response to inflammatory signals and can rise dramatically during infections, injuries, and acute illnesses.
High-sensitivity CRP, or hs-CRP, can detect much smaller concentrations and is often used in cardiovascular research.
IL-6 and TNF-α are cytokines—signalling proteins that help immune cells communicate. They participate in normal immune defence but may also remain elevated in some chronic metabolic conditions.
Importantly, no single marker provides a complete picture.
CRP can rise because of infection, obesity, injury, autoimmune disease, smoking, and many other factors. A slightly elevated result should therefore not automatically be blamed on yesterday’s dinner.
Mediterranean-Style Eating Has Some of the Strongest Evidence
The Mediterranean diet regularly appears in research on chronic inflammation.
It usually emphasizes vegetables, fruit, legumes, whole grains, nuts, seeds, fish, olive oil, herbs, and minimally processed foods. Red and processed meats, heavily refined foods, and large amounts of added sugar tend to play smaller roles.
A recent umbrella review of dietary patterns found the most consistent evidence for Mediterranean-style diets, with favorable associations or intervention effects involving CRP, IL-6, and adiponectin. However, evidence strength varied between biomarkers and studies.
A 2025 meta-analysis of 33 randomized controlled trials involving 3,476 participants similarly found significant reductions in hs-CRP, IL-6, and IL-17 with Mediterranean dietary interventions, although not every inflammatory biomarker improved significantly.
That distinction matters.
Calling the Mediterranean diet universally “anti-inflammatory” makes the evidence sound more certain than it really is. It appears to influence some markers more reliably than others.
Plant-Forward Diets May Lower CRP
Vegetarian and vegan dietary patterns have also been studied for inflammatory effects.
These diets often contain more fruit, vegetables, legumes, whole grains, nuts, seeds, fiber, and phytochemicals than typical Western dietary patterns. Depending on how they are constructed, they may also contain less saturated fat and processed meat.
A 2024 umbrella review of studies examining circulating CRP reported that vegetarian and vegan diets were among the dietary patterns associated with lower CRP in randomized trials, although the authors rated the overall evidence as relatively weak.
That does not mean avoiding animal foods is required to reduce inflammatory risk.
A diet containing fish, yogurt, eggs, vegetables, lentils, whole grains, fruit, and nuts may still be strongly plant-forward.
Food quality matters more than the label.
French fries, sugary drinks, refined bread, and cookies can technically form part of a plant-based diet too, but they do not provide the same nutritional enviroment as beans, vegetables, berries, nuts, and whole grains.
DASH May Help, but Results Depend on the Comparison Diet
The DASH diet was originally designed to reduce blood pressure, but researchers have also examined its effects on inflammation.
DASH emphasizes vegetables, fruit, whole grains, legumes, nuts, low-fat dairy products, and relatively low amounts of sodium, saturated fat, and added sugars.
A systematic review of randomized trials found that DASH lowered hs-CRP compared with usual diets. Interestingly, when DASH was compared with other healthy diets rather than ordinary eating patterns, the advantage was no longer statistically significant.
A larger later meta-analysis of people with chronic diseases found clear improvements in several cardiovascular risk factors with DASH but did not detect a significant overall reduction in CRP.
This apparent contradiction is useful.
Nutrition studies depend heavily on the comparison group. Replacing a poor-quality diet with DASH may produce noticeable changes, while replacing another already nutritious diet with DASH may create a much smaller difference.
Whole Grains, Fiber, and the Gut May Play a Role
Whole grains contain more than carbohydrate.
Oats, barley, whole wheat, brown rice, and other intact grains provide fiber, vitamins, minerals, and phytochemicals. Some fibers also reach the large intestine, where microbes ferment them into metabolites such as short-chain fatty acids.
These microbial products may influence immune signalling and intestinal function.
Clinical evidence is mixed, however.
One meta-analysis of randomized trials reported reductions in CRP and IL-6 with whole-grain consumption.
Another larger analysis found no significant overall effect on CRP, IL-6, or TNF-α, although potential benefits appeared in certain groups, particularly people with poorer baseline metabolic health.
So adding oats to breakfast should not be treated like taking an anti-inflammatory drug.
The more useful idea is that fiber-rich whole grains can form part of a broader high-quality dietary pattern.
Ultra-Processed Foods Are Linked With Less Favorable Markers
Ultra-processed foods are increasingly studied in relation to metabolic health and inflammation.
This category can include products such as sugary drinks, packaged sweets, processed snacks, some ready meals, and other industrial formulations containing highly refined ingredients.
A 2025 review examining systemic inflammatory biomarkers found that higher ultra-processed food intake was frequently associated with higher CRP or hs-CRP among adults.
Some studies also found higher IL-6 or TNF-α, although the findings were less consistant for these markers.
The important limitation is that most of this evidence is observational.
People consuming large amounts of ultra-processed foods may differ in body weight, exercise, smoking, sleep, socioeconomic circumstances, overall diet quality, and other factors that can also affect inflammation.
An umbrella review likewise found links between higher ultra-processed food consumption and several chronic health outcomes, while emphasizing uncertainty about whether processing itself, nutritional quality, or a combination of factors drives the associations.
So the practical target should be improving overall dietary quality—not fearing every food that comes in a package.
Weight Loss Can Also Change Inflammatory Markers
Sometimes the inflammatory effect attributed to a diet may partly reflect weight loss.
Adipose tissue is biologically active. Excess visceral fat in particular can release signalling molecules involved in chronic low-grade inflamation.
If a dietary pattern helps someone with excess body fat sustainably lose weight, inflammatory markers may improve partly because of the change in adipose tissue rather than because one particular ingredient directly suppressed inflammation.
This helps explain why energy-restricted diets can sometimes reduce CRP.
A meta-analysis of intermittent fasting and energy-restricted diets found modest reductions in CRP, especially in people with overweight or obesity and in interventions lasting at least eight weeks. Changes in IL-6 and TNF-α were less consistent.
Again, different markers do not necessarily move together.
That is one reason “anti-inflammatory diet” should be viewed as a useful description rather than a precise medical treatment.
What Does an Inflammation-Friendly Diet Look Like?
You do not need a complicated list of forbidden foods.
Many dietary patterns associated with healthier inflammatory profiles share similar characteristics.
Vegetables and fruit appear frequently. So do legumes, whole grains, nuts, seeds, fish, olive oil, and other minimally procesed foods.
These foods provide combinations of fiber, unsaturated fats, vitamins, minerals, and polyphenols instead of relying on one supposedly powerful nutrient.
For example, breakfast might include oats, yogurt, berries, and walnuts. Lunch could combine lentils, vegetables, whole grains, and olive oil. Dinner might contain fish, beans, leafy vegetables, and potatoes.
That pattern leaves room for less nutritious foods too.
A sustainable diet does not need to eliminate dessert, restaurant food, or every processed product. What matters is what dominates the diet over months and years.
Regular exercise, adequate sleep, avoiding smoking, and managing excess body fat where appropriate are also important because inflammation is not controlled by nutrition alone.
Do Not Chase the Lowest Possible CRP
Inflammatory biomarkers are useful research and clinical tools, but they are not numbers that everyone needs to push toward zero.
Inflammation is a necessary biological process.
CRP can also temporarily increase because you have an infection, recently experienced an injury, or are dealing with another inflammatory condition.
Someone concerned about an abnormal laboratory result should therefore discuss it with a healthcare professional rather than attempting to diagnose chronic inflammation based on diet or symptoms alone.
The goal of healthy eating is not to permanently switch off the immune system.
It is to create a dietary pattern that supports cardiovascular, metabolic, digestive, and immune health over the long term.
Dietary patterns can influence chronic inflammatory markers, but the effects are usually more subtle than popular “anti-inflammatory diet” claims suggest.
Mediterranean-style eating currently has some of the strongest evidence, while healthy vegetarian and DASH-style patterns may also improve certain markers.
Fiber-rich whole foods can contribute to a healthier dietary pattern, whereas high consumption of ultra-processed foods is frequently associated with less favorable inflammatory profiles.
No single food controls CRP, IL-6, or TNF-α on its own.
Start with the bigger picture: eat more vegetables, legumes, whole grains, fruit, nuts, seeds, and unsaturated fats while reducing the foods that currently dominate your diet without providing much nutritional value.
Make those changes consistant enough to last. Long-term dietary patterns matter much more than a one-week “anti-inflammatory reset.”
