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Updated: Sep 5, 2025
Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
Published on: July 5, 2017
Effects of Blueberry Consumption on Cardiovascular Health in Healthy Adults: A Cross-Over Randomised Controlled Trial
Yueyue Wang1, Jose Lara Gallegos1, Crystal Haskell-Ramsay2
1Department of Applied Sciences, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne NE1 8ST, UK.
Insights
This study found no significant cardiovascular benefits from consuming whole or freeze-dried blueberries compared to a control in young adults. Neither blueberry form improved blood pressure or cholesterol levels.
Area of Science:
- Nutrition Science
- Cardiovascular Health Research
- Dietary Interventions
Background:
- Blueberries are recognized for their polyphenol content and potential cardiovascular benefits.
- Previous research suggests blueberries may impact endothelial dysfunction and hypertension.
- The comparative effects of different blueberry forms on cardiovascular health are not well-established.
Purpose of the Study:
- To compare the cardiovascular effects of whole blueberries versus freeze-dried blueberry powder against a control.
- To investigate the impact of blueberry consumption on blood pressure, cholesterol, and other cardiovascular risk factors.
- To determine if blueberry form influences its cardiovascular-protective potential.
Main Methods:
- A randomized controlled trial (RCT) using a cross-over design.
- Participants underwent three treatment periods: whole blueberry, freeze-dried blueberry powder, and control, each followed by a washout period.
- Key cardiovascular markers including blood pressure, pulse wave velocity, lipid profiles, glucose, and nitrite levels were measured.
Main Results:
- No statistically significant differences were observed in systolic blood pressure, diastolic blood pressure, or lipid profiles (total cholesterol, HDL-C, LDL-C, TAG) among the treatment groups.
- Plasma nitrite levels showed a trend towards improvement with whole blueberry and blueberry powder supplementation compared to baseline, but without statistical significance.
- No significant differences were found between whole blueberries and freeze-dried blueberry powder in their effects on the measured cardiovascular parameters.
Conclusions:
- Neither whole blueberries nor freeze-dried blueberry powder demonstrated significant improvements in cardiovascular health markers in young adults compared to the control.
- The form of blueberry consumption (whole vs. freeze-dried powder) did not yield differential cardiovascular benefits in this study.
- Further research may be needed to explore potential long-term effects or specific populations that might benefit from blueberry supplementation.
Abstract:
Blueberries are rich in polyphenols, and their effect on cardiovascular health, including risk factors for endothelial dysfunction and hypertension, has been investigated in interventional studies. However, the difference between blueberry treatments in varied forms for their cardiovascular-protective effect remains poorly understood. The current study assessed the effects of whole blueberry and freeze-dried blueberry powder compared to a control on cardiovascular health in young adults. A cross-over randomised controlled trial (RCT) was implemented with 1 week of treatment for three treatment groups, each followed by 1 week of wash out period. Systolic (SBP) and diastolic blood pressure (DBP), pulse wave velocity (PWV), plasma cholesterol (low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), and total cholesterol) and triglyceride levels (TAG), and glucose and nitrite (NO2-) concentrations were compared following fresh blueberry, freeze-dried blueberry powder, and control treatments. Thirty-seven participants with a mean age of 25.86 ± 6.81 completed the study. No significant difference was observed among fresh blueberry, blueberry powder, and the control arm. Plasma NO2- levels were improved by 68.66% and 4.34% separately following whole blueberry and blueberry powder supplementations compared to the baseline, whereas the control supplementation reported a decrease (-9.10%), although it was not statistically significant. There were no other effects shown for SBP, DBP, total cholesterol, HDL-C, LDL-C, TAG, or glucose. No difference was shown between whole blueberry and freeze-dried blueberry powder consumption for improving cardiovascular health.
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