Maybe, a little, and not quickly. In most blueberry trials we read, blood inflammation markers like CRP and IL-6 did not change. The clearest result came from 1 cup a day for 6 months, which improved blood vessel function. Anthocyanins, the blue pigments in berries, lowered CRP across 32 trials.
Do blueberries reduce inflammation in the body?
Here is the honest version. Blueberries are full of anthocyanins, the pigments that turn your fingers purple. When researchers pooled 32 randomized trials of anthocyanins from many foods and extracts, CRP fell by 0.33 mg/l and IL-6 fell too. CRP (C-reactive protein) is a blood marker your liver makes when inflammation is up. IL-6 is a signal your immune cells send.
But the trials that fed people blueberries tell a quieter story.
In 40 women with high blood pressure who took blueberry powder for 8 weeks, a marker of DNA damage dropped at 4 weeks. Every other marker held steady. In 63 adults with knee arthritis, 4 months of blueberry powder left IL-6 and other blood signals unchanged. A week of wild blueberry juice moved none of 5 inflammation markers, CRP included, in 19 women at risk for diabetes.
So where did the signal show up? Inside cells. In a 6-week trial of adults with metabolic syndrome, blueberries lowered how much IL-6 and TNF-alpha the immune cells called monocytes were making. Another trial found the same pattern in blood tested in a lab dish after a fatty breakfast, while levels in the blood itself did not change.
That gap matters. A change in what immune cells are making, seen in small trials over a few weeks, is a real clue, but it is not the same as a lower CRP on your next blood test, and none of the blueberry trials we read reported one.
The dose that was tested
Fresh blueberries were measured in cups. Most other trials used freeze-dried powder, which the papers did not convert to fresh fruit. We pulled the doses into one table so you can see what people actually ate.
Half a cup of blueberries a day had no effect. One cup a day, for 6 months, improved blood vessel function.From a 2019 randomized trial in Am J Clin Nutr
| Trial | Who | Daily dose | How long | What happened to inflammation |
|---|---|---|---|---|
| Curtis 2019 | 115 adults with metabolic syndrome | 1 cup (150 g) or half a cup (75 g) | 6 months | Not the main measure; 1 cup improved blood vessel function, half a cup did nothing |
| Nair 2017 | Adults with metabolic syndrome | 22.5 g powder, twice a day | 6 weeks | IL-6 and TNF-alpha went down inside immune cells |
| Johnson 2017 | 40 women, 45 to 65, high blood pressure | 22 g powder | 8 weeks | No change in blood inflammation markers |
| Rousseau 2021 | 49 adults at risk of metabolic syndrome | 50 g powder | 8 weeks | 49 genes changed, clustered in immune pathways; standard heart and blood sugar markers did not improve |
| Du 2019 | 63 adults with knee arthritis | 40 g powder | 4 months | No change in IL-6 or other blood signals; less pain and stiffness |
| Stote 2017 | 19 women at risk for diabetes | 240 mL wild blueberry juice | 7 days | No change |
Two patterns jump out. Time mattered: the one result in fresh fruit took months. And the amount mattered: half a cup a day did nothing in the 6-month trial. The 8-week powder trial's own authors guessed that real changes might take longer than 8 weeks, or need whole berries or a bigger dose.
How to tell if it's working
You probably won't feel it, and a blood test may not show it. Most trials that measured CRP or IL-6 in the blood saw no change. The 6-month trial's gains were in blood vessel function, which you can't check at home.
There is one thing you can track. If you have stiff, sore knees, the arthritis trial checked at 2 and 4 months. People eating blueberries scored lower for pain, stiffness and trouble with daily tasks. Rate your own knees from 0 to 10 on day 1, then again at 2 and 4 months.
Cholesterol is a second clue. Across 12 trials pooled in a 2021 meta-analysis, blueberries lowered total and LDL cholesterol and the bottom blood pressure number. Your yearly checkup already measures those.
Who should skip it
Skip this plan if you are allergic to blueberries. The trials enrolled adults, so ask a pediatrician before turning it into a plan for a child. If you take medicine for diabetes, blood pressure or cholesterol, keep taking it as prescribed. Blueberries are an add-on, not a swap.
The plan
Tick what you'll try this week. Your picks stay on this device.
you have diabetes and count carbohydrates, you have kidney disease or follow a special diet, or you take any medicine and want to change it. Keep taking your medicine as prescribed and talk to your provider before changing it.
One tap. Results appear once 50 readers have voted, and the count is always real.
Reader stories
What happened for you?
Studies tell us what works on average. You know what happened in your own body. Share it here, and the next person who reads this page gets something no study can give them.
A reader who shared their story here sent you this article. When you're ready, add yours.
Ask the Research Desk
Heard something about inflammation you want checked? The best questions become articles, credited by first name only if you say yes.
How this article was made
Researched and written from 10 peer-reviewed papers. Our automated check matched every claim against the exact words of its source, confirmed every paper exists in PubMed, and found none retracted. Checked November 4, 2026. Not individually reviewed by a doctor. Photos are illustrative; the people in them are not patients or readers.
Grades run Strong, Moderate, Emerging, Early and Not supported, and the grade decides the words we may use. How we grade evidence · Medical disclaimer
Sources
- Randomized trialBlueberries improve biomarkers of cardiometabolic function in participants with metabolic syndrome-results from a 6-month, double-blind, randomized controlled trial.Curtis PJ, van der Velpen V, Berends L et al. Am J Clin Nutr, 2019.PubMedFull paper
- Systematic reviewBlueberries and their bioactives in the modulation of oxidative stress, inflammation and cardio/vascular function markers: a systematic review of human intervention studies.Martini D, Marino M, Venturi S et al. J Nutr Biochem, 2023.PubMedFull paper
- Meta-analysisImpact of dietary anthocyanins on systemic and vascular inflammation: Systematic review and meta-analysis on randomised clinical trials.Fallah AA, Sarmast E, Fatehi P et al. Food Chem Toxicol, 2020.PubMedFull paper
- Randomized trialBlueberry supplementation attenuates oxidative stress within monocytes and modulates immune cell levels in adults with metabolic syndrome: a randomized, double-blind, placebo-controlled trial.Nair AR, Mariappan N, Stull AJ et al. Food Funct, 2017.PubMedFull paper
- Randomized trialEffects of daily blueberry consumption on circulating biomarkers of oxidative stress, inflammation, and antioxidant defense in postmenopausal women with pre- and stage 1-hypertension: a randomized controlled trial.Johnson SA, Feresin RG, Navaei N et al. Food Funct, 2017.PubMedFull paper
- Randomized trialBlueberries Improve Pain, Gait Performance, and Inflammation in Individuals with Symptomatic Knee Osteoarthritis.Du C, Smith A, Avalos M et al. Nutrients, 2019.PubMedFull paper
- StudyThe effects of 100% wild blueberry (Vaccinium angustifolium) juice consumption on cardiometablic biomarkers: a randomized, placebo-controlled, crossover trial in adults with increased risk for type 2 diabetes.Stote KS, Sweeney MI, Kean T et al. BMC Nutr, 2017.PubMedFull paper
- Randomized trialAn 8-week freeze-dried blueberry supplement impacts immune-related pathways: a randomized, double-blind placebo-controlled trial.Rousseau M, Horne J, Guénard F et al. Genes Nutr, 2021.PubMedFull paper
- Randomized trialPostprandial Inflammatory Responses and Free Fatty Acids in Plasma of Adults Who Consumed a Moderately High-Fat Breakfast with and without Blueberry Powder in a Randomized Placebo-Controlled Trial.Ono-Moore KD, Snodgrass RG, Huang S et al. J Nutr, 2016.PubMedFull paper
- Meta-analysisBlueberry intervention improves metabolic syndrome risk factors: systematic review and meta-analysis.Carvalho MF, Lucca ABA, Ribeiro E Silva VR et al. Nutr Res, 2021.PubMedFull paper
