How long does an anti-inflammatory diet take to work?

Weeks to months. In trials, CRP changes were measured after several months to two years, so a fair first check is an hs-CRP retest at about 3 months, on the same test and while you are well.

Is the Mediterranean diet the same as an anti-inflammatory diet?

Largely, yes. The Mediterranean diet is the version that has been tested in randomized trials, including PREDIMED, where, in adults at high heart risk, it lowered the combined rate of heart attack, stroke and cardiovascular death by about 30%. Most anti-inflammatory food lists are the Mediterranean pattern with a different label.

Can an anti-inflammatory diet help arthritis or autoimmune disease?

It can sit alongside treatment for arthritis, lupus or another autoimmune condition, and it may help with the heart risk those conditions carry, though the large outcome trials did not study people with these conditions. It does not replace prescribed treatment, the evidence for symptom relief is much thinner than for heart outcomes, and it is worth talking through with the specialist who manages your care. If you are not sure whether a raised CRP is autoimmune, our guide to autoimmune antibody tests explains what a clinician may check.

What is the quickest way to lower inflammation?

For low-grade inflammation there is no quick fix: diet, weight loss, exercise, better sleep and stopping smoking lower CRP over weeks to months. A very high CRP, over 10 mg/L, usually has an acute cause such as an infection, and finding that cause with a doctor is the fastest way to bring it down.

Anti-inflammatory diet: what to eat, what the trials show,

The distinctions

01
The effect belongs to the whole pattern, not to any one food
The CRP fall from an anti-inflammatory diet, about 1 mg/L on average, comes from the whole Mediterranean pattern kept up for months and the weight that comes off with it, not from any single food added or removed. Losing about 8 kg lowers CRP about as much as the average Mediterranean-diet effect; superfoods and cutting seed oils do not.

An anti-inflammatory diet is the Mediterranean way of eating, kept up for months: vegetables, fruit, beans, whole grains, oily fish, nuts and extra-virgin olive oil, with little ultra-processed food. In randomized trials it lowers CRP, the blood marker of low-grade inflammation, by about 1 mg/L on average, partly through the weight that comes off with it ². Seed oils, dairy and nightshades are not proven culprits, and an hs-CRP test before you start and about 3 months later shows whether the diet is working for you.

What an anti-inflammatory diet is

The target is chronic low-grade inflammation: slow, steady immune activity that causes no swelling or pain but shows up in the blood as a slightly raised CRP (C-reactive protein, a protein the liver makes when the immune system is busy). It is a different thing from the redness and swelling around a cut, which is healing. Our guide to <a href="/learn/chronic-inflammation">chronic inflammation</a> explains why the slow kind matters for the heart and blood vessels.

The version researchers have tested is the Mediterranean diet, a close cousin of DASH, the blood-pressure diet: both are built on plants, whole grains, beans, fish and unsaturated fats, with little processed food. Calling it anti-inflammatory adds a goal and a way to measure it. The goal is a lower CRP; the measure is the hs-CRP test (high-sensitivity CRP, a version that reads accurately at the low levels relevant to heart risk).

It is likely to help most where inflammation has a metabolic cause: extra weight around the waist, <a href="/conditions/insulin-resistance">insulin resistance</a>, <a href="/conditions/metabolic-syndrome">metabolic syndrome</a> or a high risk of heart disease. The trials that showed the biggest changes were run in people like this ¹². Someone who is lean, active and already eats this way has less room to move.

What the trials show

The Mediterranean pattern has been tested in randomized trials with blood markers and with heart attacks and strokes as outcomes, which is better evidence than most diet advice has. A meta-analysis (a study that pools the results of many trials) gives the average effect across them.

Study	Who	What changed	Result
Esposito et al., JAMA 2004	180 adults with metabolic syndrome	2 years of Mediterranean-style eating vs a standard prudent diet	Lower hs-CRP and IL-6 (interleukin-6, another inflammation signal in the blood), less insulin resistance ⁷
Schwingshackl and Hoffmann, 2014 meta-analysis	Pooled randomized trials	Mediterranean diets vs control diets	CRP about 1 mg/L lower (mean difference -0.98 mg/L), lower IL-6, better blood-vessel function ²
PREDIMED, NEJM 2018	7,447 adults in Spain at high heart risk	Mediterranean diet plus extra-virgin olive oil or nuts vs a reduced-fat diet	About 30% lower combined rate of heart attack, stroke and cardiovascular death (31% lower in the olive-oil group, 28% in the nut group); stroke drove most of the difference ¹

The 2018 PREDIMED paper is a re-analysis published after randomization problems were found at some sites, and the roughly 30% reduction held ¹. A 1 mg/L fall in CRP is meaningful on the hs-CRP scale, where the heart-risk bands are only 1 and 3 mg/L apart ⁵: a reading of 3.5 mg/L that falls by 1 mg/L would sit in the average band instead of the higher one. That changes the label on the number; trials have not shown that lowering CRP by diet alone lowers heart risk.

Researchers also score diets for how inflammatory they are, using the Dietary Inflammatory Index. Across 14 studies, people whose diets scored most pro-inflammatory had about 36% higher risk of cardiovascular disease and cardiovascular death than those whose diets scored least ⁸. These were observational studies, so they show a link rather than proof, but they point the same way as the trials.

The hard outcome evidence is about heart disease and stroke. There is much less trial evidence that the diet relieves joint pain, fatigue or the general sense of feeling inflamed, so treat those as possible side benefits, not promises.

What to eat more of

The food list below follows the Mediterranean pattern, with rough amounts taken from the trials and from American Heart Association advice. Amounts are for food, not supplements.

Eat more	Roughly how much	Why it is on the list
Vegetables and fruit, especially leafy greens and berries	Half of each plate	Fiber and plant compounds; the base of every tested pattern
Beans, lentils and chickpeas	Several times a week	Fiber and protein that replace processed meat
Whole grains (oats, brown rice, whole-wheat bread, barley)	In place of white bread, white rice and pastries	Slower effect on blood sugar than refined starch
Oily fish (salmon, sardines, mackerel, trout)	One to two meals a week, as the American Heart Association advises ⁹	Long-chain omega-3 fats
Extra-virgin olive oil	The main fat for cooking and dressing; fine for everyday cooking	The fat used in the PREDIMED olive-oil arm ¹
Nuts (walnuts, almonds, hazelnuts)	A small handful a day, about 30 g, as in PREDIMED	The PREDIMED nut arm ¹
Yogurt and other fermented dairy	Regularly, if you like them	Fit the pattern; dairy trials lean slightly anti-inflammatory ¹⁰
Herbs and spices (ginger, turmeric, garlic)	As flavor	Make plant-heavy cooking taste good; cooking amounts have no proven effect on CRP

If you take warfarin, keep the amount of leafy greens steady from week to week and tell your prescriber before you change your diet a lot, since the vitamin K in greens changes how warfarin works.

Foods that cause inflammation, and what to cut back on

Ultra-processed food is the biggest single target. In a tightly controlled ward study, adults offered an ultra-processed diet ate about 500 more calories a day and gained weight, compared with two weeks on an unprocessed diet matched for the nutrients on offer ³. Extra weight is one of the main drivers of a raised CRP ⁶, which is why cutting ultra-processed food can lower inflammation even without any special foods added.

The rest of the list is sugary drinks and refined carbohydrates, processed meat (bacon, ham, salami, hot dogs), heavy drinking, and trans fats, which are now largely gone from the US food supply. Sugar is not a direct toxin to the immune system; it pushes inflammation up mainly through weight gain, blood-sugar spikes and higher triglycerides. Swaps last longer than bans:

Swap this	For this
White bread, white rice	Whole-wheat bread, brown rice, oats, barley
Butter for cooking	Extra-virgin olive oil
Deli meat in sandwiches	Canned fish, beans, hummus, egg
Soda and sweetened coffee drinks	Water, sparkling water, plain coffee or tea
Chips, crackers and cookies as snacks	Nuts, fruit, yogurt

Seed oils, dairy, eggs, coffee, nightshades and gluten

A lot of advice online tells people to drop foods that the evidence does not implicate. The common claims, checked:

Food	The claim	What the evidence says
Seed oils (sunflower, corn, soybean)	Omega-6 linoleic acid feeds inflammation; keep omega-6 to omega-3 at 2:1	Randomized trials adding linoleic acid did not raise inflammatory markers in healthy adults ⁴. The American Heart Association advises at least 5 to 10% of energy from omega-6 fats ¹¹.
Dairy	Milk and cheese are inflammatory	A review of 52 clinical trials found dairy overall slightly anti-inflammatory, with the exception of people allergic to cow's milk ¹⁰.
Eggs	Limit to once a week	No trial supports a once-a-week limit; eggs sit in the Mediterranean pattern in moderate amounts.
Coffee	Coffee is inflammatory	There is no good evidence that plain coffee raises CRP, and it fits the pattern. Sugar-loaded coffee drinks are the part to cut.
Nightshades (tomatoes, peppers, eggplant)	Trigger joint inflammation	No trial evidence; tomatoes and peppers are staples of the tested diets.
Gluten	Inflammatory for everyone	Matters with <a href="/conditions/celiac-disease">celiac disease</a> or a diagnosed sensitivity; whole grains with gluten are part of the tested pattern. If you suspect celiac disease, get tested before cutting gluten, since the tests become unreliable once gluten is out of the diet.

Virtually no evidence is available from randomized, controlled intervention studies among healthy, noninfant human beings to show that addition of LA to the diet increases the concentration of inflammatory markers.Johnson and Fritsche, Journal of the Academy of Nutrition and Dietetics, 2012 ⁴

IgG food sensitivity tests are often sold as a way to find your personal inflammatory foods. A positive IgG result mostly reflects foods you eat often, and does not show which foods cause symptoms; our page on the <a href="/learn/food-sensitivity-test">food sensitivity test</a> covers why.

What a day of eating looks like

A simple plate rule covers most meals: half the plate vegetables or salad, a quarter whole grains or potatoes, a quarter protein (fish, beans, chicken, eggs), and olive oil as the fat. One example day built from that rule:

1BreakfastOats cooked with milk or a plant milk, topped with berries and a spoon of chopped walnuts; coffee or tea.
2LunchLentil and vegetable soup, whole-wheat bread with olive oil, a piece of fruit.
3DinnerBaked salmon or sardines, roasted vegetables in olive oil with garlic, a side of brown rice or barley, a green salad.
4SnackPlain yogurt with fruit, or a handful of almonds.

What moves inflammation as much as food

Weight is the largest lever on CRP outside the diet itself. A systematic review of lifestyle and surgical weight-loss studies found CRP fell by about 0.13 mg/L for every kilogram lost ⁶. The effect belongs to the whole pattern and the weight that comes off with it, not to any one food you add or remove: losing about 8 kg lowers CRP about as much as the average Mediterranean-diet effect ²⁶.

Exercise: a meta-analysis of 83 trials found exercise training lowers CRP, with larger falls when it also reduces body fat ¹².
Sleep: a meta-analysis of 72 studies linked disturbed sleep and very long sleep with higher CRP and IL-6; the link with short sleep was weak ¹³.
Smoking: smoking raises CRP, and stopping removes one of its steadiest drivers.
Alcohol: heavy drinking raises inflammatory markers. The Mediterranean pattern tested in trials included at most moderate wine with meals, and there is no reason to start drinking for the diet.

A low-carb or keto diet is another route people take to weight loss and lower insulin, with different trade-offs on a lipid panel; our <a href="/learn/keto-diet">keto diet guide</a> covers those.

Where supplements fit

Food comes first, because the outcome trials tested meals, not capsules. Omega-3 from oily fish is part of the pattern, and spices such as turmeric fit it as flavor. As supplements for inflammation, omega-3 and curcumin have mixed evidence; the cards below summarize it, and our guide to <a href="/learn/supplements-based-on-your-blood-test">supplements based on your blood test</a> covers when one makes sense. Fish oil, turmeric and ginger can add to the effect of blood thinners and antiplatelet drugs, and high-dose turmeric products have been linked to rare liver injury. If you take one of those drugs, have liver disease or have a procedure coming up, ask your prescriber or pharmacist before starting any of them.

Supplements studied for inflammation

Mixed evidenceOmega-3 (fish oil)Some trials show modest falls in inflammatory markers; eating oily fish gives the same fats with the rest of the meal.In our shop

Mixed evidenceTurmeric and curcuminSome small trials report lower CRP, but curcumin is poorly absorbed and study quality varies.In our shop

Early evidenceGingerFew, small trials; cooking amounts are far below the amounts studied.In our shop

How to know it's working: test, change, retest

The hs-CRP test tells you whether the diet is doing anything for you. Under 1 mg/L is lower cardiovascular risk, 1 to 3 mg/L average, and over 3 mg/L higher risk, and because CRP moves day to day, two tests about two weeks apart give a truer picture ⁵. A 2025 American College of Cardiology statement treats a raised hs-CRP in otherwise healthy people as a marker of a higher-risk group worth acting on ¹⁴. Our <a href="/biomarkers/hs-crp">hs-CRP</a> page covers the test itself.

Where an example hs-CRP of 3.6 mg/L fallsmg/L

3.6 mg/LHigher risk

Lower risk0–1Average1–3Higher risk3–10Look for a cause10–12

An hs-CRP of 3.6 mg/L sits just inside the higher-risk band. Repeat it in about two weeks while well. If it holds, bring it to your doctor to read alongside your cholesterol, blood pressure and blood sugar; it is also a reasonable baseline for the diet and a 3-month retest.

Bands from the AHA/CDC scientific statement on markers of inflammation, Pearson et al., Circulation 2003 ⁵.

Heads upWhen a high CRP is not a diet project

An hs-CRP over 10 mg/L usually means an infection, an injury or an active inflammatory illness; the AHA/CDC statement advises looking for the source and repeating the test once it has passed ⁵. See a doctor promptly if a raised CRP comes with fever, swollen or hot joints, night sweats, a persistent cough or <a href="/symptoms/unexplained-weight-loss">unexplained weight loss</a>. Our page on <a href="/biomarkers/crp/high">high CRP</a> covers the causes. If your hs-CRP is over 3 mg/L on two tests, take it to your clinician as part of your overall heart risk, alongside a <a href="/learn/how-to-read-your-lipid-panel">lipid panel</a>, blood pressure and HbA1c; our guide to <a href="/learn/cardiac-markers-explained">heart markers</a> lists what to ask for.

1Test before you startGet an hs-CRP while you are well, with no cold, injury or hard workout in the days before; our guide on <a href="/learn/how-to-prepare-for-a-blood-test">preparing for a blood test</a> covers the rest. Two readings two weeks apart give a steadier baseline. If either reading is over 10 mg/L, see a doctor to find the cause before treating it as a diet project.
2Change the patternMake the swaps above and keep them for at least 12 weeks. Note any weight change, since weight moves CRP too.
3Retest at about 3 monthsUse the same lab and the same test (hs-CRP, not standard CRP; <a href="/compare/hs-crp-vs-crp">here is the difference</a>). Compare the trend across readings, not one result, as our guide on <a href="/learn/trends-beat-single-readings">trends over single readings</a> explains.

How an hs-CRP might move on a Mediterranean diet

Illustrative values for one person, not a study result. The size of the fall, about 1 mg/L, matches the average effect of Mediterranean diets in the Schwingshackl and Hoffmann 2014 meta-analysis ²; real readings wobble more from test to test.

The same diet also moves the metabolic markers that sit behind a raised CRP. Triglycerides, fasting insulin and HbA1c often improve on the same timeline, and a fall in those alongside CRP is more convincing than one CRP result. Our guide to <a href="/learn/inflammation-markers-explained">inflammation markers</a> explains how CRP, <a href="/compare/crp-vs-esr">ESR</a> (erythrocyte sedimentation rate, an older and slower inflammation test) and the others relate; CRP is the one to track for a diet change.

Markers to read before and after

High-Sensitivity C-Reactive ProteinThe main measure of whether the diet lowered low-grade inflammation.C-Reactive ProteinThe standard test; useful for spotting a high reading that needs a cause found.TriglyceridesOften falls when refined carbs, sugary drinks and alcohol come down.Insulin, FastingShows whether insulin resistance, a common driver of raised CRP, is easing.Hemoglobin A1cThree-month blood sugar average; moves with weight loss and fewer refined carbs.

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