Berries: the blood pressure effect that keeps not appearing

Berries as a category have no composition table. There is no single food called berries, the composition databases hold no record under that name, and so this page cannot tell you what is in 100 g. What the category does have is trials, and they come out flatter than the reputation. In 9 randomised trials on 547 adults with high or raised blood pressure, berry supplements moved resting systolic pressure by 2.35 mmHg, with a confidence interval running from -4.98 to 0.29, so the result missed statistical significance. The review authors rated the certainty of that evidence low to very low across every outcome. The best-studied corner is flatter still. Across 17 trials of blueberry and cranberry in people with cardiometabolic disease, only 2 found any blood pressure benefit, and pooled systolic pressure fell by 0.81 mmHg. In 14 trials on 611 people with metabolic syndrome, berries raised HDL cholesterol by 1.77 mg/dL and left the rest of the lipid panel alone, and a rise that small sits inside the measurement noise of the test that found it. Berries belong to the vegetables, fruits and berries group that observational reviews link to lower risk, and nothing on this page separates them from it. They are not a blood pressure treatment.

What your body absorbs

• In an 18-person crossover trial, a 150 g serving of blueberries and a protein bar holding the same serving delivered nearly the same polyphenol metabolites to blood, with only the timing of peaks differing. — 18 adults, mean age 42.1 years, mean BMI 24.8, blinded 4-way crossover, 1 serving of 150 g blueberries of two varieties against a blueberry protein bar and a control beverage, blood and urine over 48 hours (n = 18) Evidence B source
  Serum area under the curve similar across all berry treatments; total urinary recovery higher after Elliott blueberry than after Olympia blueberry and the bar by 21 and 29 per cent; peak of one metabolite 1.24 hours later after whole fruit than after the bar

What cooking and storage change

• Pooled surveillance puts norovirus or hepatitis A virus on 2.12 per cent of berry samples, and whether the berries were fresh or frozen changed the figure. — berry samples in studies collected from database records up to December 2022, farms and retailers, several continents (n = not stated in the abstract) Evidence C source
  Combined prevalence of norovirus and hepatitis A virus 2.12 per cent (95% CI 1.74 to 2.59); higher in berries from African countries; norovirus GI higher on farms than at retail; falling over the study period
• In a meta-analysis of toxic elements across fresh and processed fruits, berries held the lowest arsenic and lead concentrations of any fruit measured, and the hazard quotient stayed under 1 even for infants. — fresh and processed fruits reported in studies pooled from international databases, non-carcinogenic risk assessed for infants and adults (n = not stated in the abstract) Evidence C source
  Berries lowest for arsenic and lead among the fruits compared; total target hazard quotient below 1 in infants; highest arsenic, cadmium and lead in pineapple, mango and cherry

What it does to your health

• In 9 randomised trials on 547 adults with raised blood pressure, berry supplements moved resting systolic pressure by 2.35 mmHg at most, a change that was not statistically significant. — adults with hypertension or elevated blood pressure, 9 randomised controlled trials, searched to May 2025 (n = 547) Evidence A source
  Resting systolic -2.35 mmHg (95% CI -4.98 to 0.29); resting diastolic -1.04 mmHg (95% CI -2.38 to 0.76); 24 h ambulatory diastolic -1.11 mmHg (95% CI -2.04 to -0.17), driven by cross-over trials
• In 14 trials on 611 people with metabolic syndrome, berries raised HDL cholesterol by 1.77 mg/dL and left LDL, total cholesterol, triglycerides, blood pressure, glucose and insulin untouched. — people with metabolic syndrome, 14 randomised trials, 327 intervention and 284 control subjects (n = 611) Evidence A source
  HDL cholesterol +1.771 mg/dL (95% CI 1.415 to 2.128); no change in LDL, total cholesterol, triglycerides, leptin, BMI, waist circumference, blood pressure, HbA1c, HOMA-IR, glucose or insulin
• Pooling 42 intervention arms from 38 randomised trials, berries lowered body mass index by 0.13 units and body fat by 0.50 percentage points, with body weight unchanged. — adults in 38 randomised controlled trials, 42 intervention arms, studies published before June 2024 (n = 42 intervention arms) Evidence A source
  BMI -0.13 (95% CI -0.22 to -0.04); body fat -0.50 per cent (95% CI -0.77 to -0.23); body fat mass -0.67 kg (95% CI -1.19 to -0.16); no change in weight, waist, hip, waist-to-hip ratio or fat-free mass
• The scoping review behind the Nordic Nutrition Recommendations 2023 found the steepest risk reductions from vegetables, fruits and berries at the lower end of intake, with the firmest evidence for stomach and lung cancer, cardiovascular disease and all-cause mortality. — observational evidence reviewed for the Nordic Nutrition Recommendations 2023, based on the WCRF and AICR 2018 expert report plus systematic reviews and meta-analyses from 2011 to 2023 (n = review of systematic reviews) Evidence C source
  Direction and shape: steeper risk reduction at lower intake ranges, with further reduction at higher intake only for cardiovascular disease; weaker association for type 2 diabetes

Safety, limits and interactions

• A 71-year-old woman on warfarin was hospitalised with bleeding and an unmeasurable INR after 4 days of goji berry juice, scoring 6 on the Naranjo scale for a probable drug interaction. — one 71-year-old woman on warfarin after knee surgery, 4 days of goji juice before admission (n = 1) Evidence D source
  Prothrombin time above 120 seconds on admission, with epistaxis, bruising and rectal bleeding; INR fell to 2.6 over 2 days after stopping both the juice and warfarin; Naranjo score 6, probable

What people believe that the data does not support

• Across 17 trials of blueberry and cranberry in people with cardiometabolic disease, only 2 found any blood pressure benefit, and pooled systolic pressure fell by 0.81 mmHg. — patients with cardiometabolic diseases, 17 randomised clinical trials, searched to August 2023 (n = 17 trials) Evidence A source
  Systolic -0.81 mmHg (95% CI -2.26 to 0.63); diastolic -0.15 mmHg (95% CI -1.36 to 1.05); no change with duration or age
• The European Union holds 4 health claims about berries and has authorised none of them, including the claim that their antioxidants make them suitable for a heart-friendly diet. — EU Register on nutrition and health claims, snapshot 2026-09-21, 4 claims filed for berries, all non-authorised (n = 4 claims) Evidence E source
  0 authorised, 4 rejected; 21 CFR 101 in the United States does not mention berries at all

What is still unknown

• A GRADE-rated review of 19 studies on berries and bone found certainty low to moderate for bone density, low for turnover markers and very low for fractures. — 19 studies: 5 in humans (premenopausal, twin and postmenopausal women), 9 animal, 5 in vitro, searched to 23 April 2025 (n = 19 studies) Evidence C source
  Observational cohorts link higher anthocyanin intake to greater bone mineral density; small trials of blackcurrant and blueberry show modest benefit on whole body density, turnover markers and calcium retention, with mixed biomarker results; GRADE certainty low to moderate for density and very low for fractures
• Across 13 studies of Vaccinium berries in healthy exercisers, none showed better exercise performance and only 1 reported any benefit for recovery. — healthy individuals supplemented with blueberries, cranberries or bilberries against a control group, 13 articles (n = 13 studies) Evidence C source
  No significant difference in exercise performance in any study; 1 of 13 reported benefit for recovery markers; limited evidence of any effect on interleukins or C-reactive protein after exercise
• In 26 mouse studies pooled together, berry phytochemicals shrank atherosclerotic plaque in male animals while the same effect did not reach significance in females. — 26 studies in ApoE deficient and LDL receptor deficient mice, searched to November 2022 (n = 26 studies) Evidence D source
  Plaque reduction significant in male mice and not significant in female mice; probiotics reduced plaque in both sexes; Firmicutes to Bacteroidetes ratio fell and Akkermansia muciniphila rose

The bottom line

On weight the numbers are real and small. Pooling 42 intervention arms from 38 randomised trials, berries lowered body mass index by 0.13 units and body fat by 0.50 percentage points, while body weight itself did not move. A BMI shift of 0.13 is about 0.4 kg for an adult of average height. That analysis pooled whole berries with berry extracts, and its authors call the data limited and ask for better trials. Form matters less than you might expect. In a blinded 4-way crossover, 18 adults took a 150 g serving of blueberries or a protein bar holding the same serving, and the polyphenol metabolites reaching the blood were much the same either way. Total urinary recovery differed by 21 and 29 per cent between the two varieties and the bar, and one metabolite peaked 1.24 hours later after the whole fruit. That is 18 people and one crop, and metabolites in blood are not a health outcome. Two questions stay open. A GRADE-rated review of 19 studies on berries and bone, only 5 of them in humans, came out low to moderate for bone density and very low for fractures, with no pooled number and an explicit refusal to make recommendations. In 13 studies of blueberry, cranberry and bilberry in healthy exercisers, no study found better performance and 1 of 13 found any benefit for recovery markers, and most of those studies were rated high quality, which makes the null harder to wave away. A meta-analysis of 26 mouse studies found that berry phytochemicals shrank arterial plaque in male animals while the same effect missed significance in females. Human berry trials mostly do not report results by sex, so nobody knows whether that difference exists in people. On how much to eat, the scoping review behind the Nordic Nutrition Recommendations 2023 found the steepest risk reductions at the lower end of intake for vegetables, fruits and berries pooled together, so the first servings count for more than the later ones. Nothing in it is about berries alone. The European Union has 4 filed claims about berries and authorised none of them, including the claim that their antioxidants make them suitable for a heart-friendly diet, and United States labelling rules do not mention berries at all. The handling notes are the practical part. Pooled surveillance found norovirus or hepatitis A virus on 2.12 per cent of berry samples, with a confidence interval from 1.74 to 2.59 per cent, and the authors warn that heterogeneity was high and ask for caution with that single figure. Whether the samples were fresh or frozen changed it, and a virus on a sample is not an infection in an eater. On heavy metals berries came out at the bottom of the range. In a pooled comparison across fruits, berries held the lowest arsenic and lead of any fruit measured, with the hazard quotient below 1 even for infants, which is a screening estimate rather than a measurement of the punnet in your hand. One 71-year-old woman on warfarin was hospitalised with bleeding and a prothrombin time above 120 seconds after 4 days of goji berry juice, scoring 6 on the Naranjo scale for a probable interaction. Her warfarin was stopped at the same time as the juice, so the case cannot separate the two, and goji is one berry whose behaviour carries over to nothing else on this page. We found no evidence here on berry allergy, on children or on pregnancy.

Sources

1. bry-r4-07 · randomised crossover trial
   Differing berry (poly)phenol content and bioaccessibility only minimally affect bioavailability following consumption of blueberries relative to a blueberry-rich protein bar, suggesting (poly)phenol-dense foods, such as bars and snacks, could provide similar health benefits as raw fruits.
   Am J Clin Nutr, 2025 · checked 2026-09-24
2. bry-r4-05 · meta-analysis of prevalence data
   The prevalence of NoV and HAV in berries was calculated at 2.12 % (95 % CI 1.74-2.59 %), and no statistically differences were observed among the viral types or genogroup categories...A significant influence of the sample condition (fresh or frozen) was observed in relation to the prevalence of NoV GII and HAV.
   Int J Food Microbiol, 2024 · checked 2026-09-24
3. bry-r4-06 · systematic review and meta-analysis
   According to findings highest concentrations of As, Cd and Pb were observed in pineapple, mango, and cherry, while the lowest concentrations of these metals were found in berries, pineapple, and berries...Overall, the consumption of fresh and processed fruits is safe and does not pose a risk to the health of consumers.
   Biol Trace Elem Res, 2023 · checked 2026-09-24
4. bry-r4-01 · systematic review and meta-analysis of RCTs
   Nine RCTs (547 participants) were included...Current evidence does not support a consistent effect of berry supplementation on blood pressure or related cardiometabolic outcomes in this population, given the low to very low certainty of the available evidence.
   Nutrients, 2026 · checked 2026-09-24
5. bry-r4-03 · systematic review and meta-analysis of RCTs
   After full screening, 14 trials were selected for final analysis, involving 327 intervention and 284 control subjects with MetS. Berry consumption significantly increased HDL-C (WMD: 1.771 mg/dL, 95% CI: 1.415-2.128) without affecting LDL-C, TC, TG or leptin levels.
   Int J Food Sci Nutr, 2025 · checked 2026-09-24
6. bry-r4-04 · systematic review and meta-analysis of RCTs
   Data from 42 intervention arms from 38 studies were included in the analysis...The meta-analysis revealed a statistically significant decrease in body mass index (weighted mean difference [WMD] = -0.13 [95% CI, -0.22 to -0.04]; P = .004) and in body fat percentage (WMD = -0.50 [95% CI, -0.77 to -0.23]; P = .000)
   Nutr Rev, 2026 · checked 2026-09-24
7. bry-r4-12 · scoping review
   The most robust evidence is found for cancer in the gastric system and lung cancer, cardiovascular disease, and all-cause mortality. Steeper risk reductions are generally seen at the lower intake ranges, but further reductions have been seen for higher intakes for cardiovascular disease.
   Food Nutr Res, 2024 · checked 2026-09-24
8. bry-r4-08 · case report
   Application of the Naranjo adverse drug reaction probability scale indicated a probable relationship (score of 6) between the patient's elevated INR with associated bleeding and her concomitant use of L. barbarum and warfarin.
   Pharmacotherapy, 2012 · checked 2026-09-24
9. bry-r4-02 · systematic review and meta-analysis of RCTs
   A total of 17 articles were included, from which two found significant results from blueberry and/or cranberry supplementation in reducing BP...Blueberry and/or cranberry supplementation had neutral effects on SBP and DBP in patients with cardiometabolic diseases, regardless of duration or age.
   Phytother Res, 2024 · checked 2026-09-24
10. bry-r4-09 · regulatory decision
    POL-HC-6680 Berries (lingonberry, cloudberry, blueberry, currants, raspberry and strawberry) Natural berries contain plenty of natural antioxidants (polyphenolic compounds, Vitamin C and carotenoids) and fibre but only a small amount of energy and sodium. For this reason they are very suitable for a heart-friendly diet. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6680, snapshot 2026-09-21 · checked 2026-09-24
11. bry-r4-10 · systematic review
    Nineteen studies were included (5 human, 9 in vivo, 5 in vitro)...By GRADE, certainty was low-moderate for BMD, low for biomarkers, and very low for fractures.
    Nutrients, 2025 · checked 2026-09-24
12. bry-r4-11 · systematic review
    Of the 13 articles included in this review, no significant differences in the exercise performance were found and only one study reported benefits for markers of recovery...Vaccinium berry supplementation is not effective in modulating markers of exercise-induced inflammation and oxidative distress in healthy individuals
    Food Funct, 2024 · checked 2026-09-24
13. bry-r4-13 · meta-analysis of animal studies
    The results showed that phytochemicals reduced atherosclerosis, which was significant in male mice, but not in females...Berries and phytochemicals modulated gut microbial composition by reducing the Firmicutes/Bacteroidetes (F/B) ratio and by upregulating health-promoting bacteria, including Akkermansia muciniphila.
    Int J Mol Sci, 2023 · checked 2026-09-24