Insights & Discussion
Moderate consumption of blueberries may effectively reduce bone loss in healthy postmenopausal women.
The research began with a blueberry dose-response study with ovariectomized rats, used as an experimental model simulating postmenopausal conditions. These rats were fed with various doses of blueberry powder, with the aim to identify an optimal dosage for bone calcium retention. The experiment then translated to a human study where fourteen healthy women, all more than four years past menopause, were examined. A baseline was established, and then each participant was provided with varying dosages of freeze-dried blueberry powder equivalent to defined portions of fresh blueberries, to be consumed daily for a series of six weeks at a time. Tracing calcium in the urine was employed as a method to monitor bone calcium balances in both the rat and human trials.
The collected data indicated that both the rat and human subjects benefited from blueberry interventions at lower doses. Higher doses, however, showed no such beneficial impact on bone calcium balance. In human subjects, net bone calcium retention increased with low and medium doses of blueberry consumption. Increased urinary excretion of hippuric acid, a metabolite of the antioxidants present in blueberries, was observed with an increase in blueberry consumption. No significant associations were found between bone resorption biomarkers and the interventions implemented in the study.
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Greater intake of blueberries considerably decreases the risk of age-related macular degeneration, while a remarkable dietary intake of anthocyanins inversely correlates with cataract incidents.
2024 The Journal of Nutrition Intake of Blueberries, Anthocyanins, and Risk of Eye Disease in Women Sesso HD, Rautiainen S, Park SJ, Kim E, Lee IM, Glynn RJ, et al.
Cohort Study Age-Related Macular Degeneration Anthocyanins Blueberry
Middle-aged and older women, numbering 36,653 and 35,402 originally without cataract and AMD, provided data for the study via semiquantitative food frequency questionnaires. Insights were derived on the consumption of blueberries by these women, with frequency varied from none to over two servings weekly. Additionally, total anthocyanin consumption was analysed, with major subclasses adjusted for energy and then into quintiles. Self-reported risk factors for eye diseases were adjusted in the multivariable hazard ratios.
On analysis, it was found that a significant portion of participants consumed a minimum of one serving of blueberries weekly. Thus, compared to no blueberry intake, it was observed that those consuming the fruit exhibited a decrease in the total instances of AMD, while visually significant AMD remained unaffected. Furthermore, dietary anthocyanin showed a modest yet significant inverse association with cataract occurrences, but no notable correlation with AMD.
Berry fruits such as blueberries, cranberries, raspberries, and strawberries could potentially improve gut microbiota and reverse dysbiosis in chronic kidney disease patients.
2023 Nutrition Reviews Blueberry, cranberry, raspberry, and strawberry as modulators of the gut microbiota: target for treatment of gut dysbiosis in chronic kidney disease? From current evidence to future possibilities Coutinho-Wolino KS, Melo MFS, Mota JC, Mafra D, Guimarães JT, Stockler-Pinto MB
Review Article Blueberry Chronic Kidney Disease Gut Microbiota
Methodology: This research explores the therapeutic potential of berry fruits, including blueberries, cranberries, raspberries, and strawberries, in relation to modulating gut microbiota in chronic kidney disease (CKD) patients. The fruit’s rich polyphenol and nutrient content are assumed to promote the selective growth of beneficial bacteria, thus improving the clinical status of these patients. The study scrutinizes the impact on the abundance of mucus-producing bacteria and short-chain fatty acids specifically.
Discussion of Results: The gathered evidence illustrates that berry fruits, particularly with a daily intake of 5 mg, can promote diversity in the gut microbiota and possibly reverse dysbiosis, a common issue in chronic kidney disease patients. These fruits are found to increase the expression of mRNA involved in gut tight junctions such as occludin, TJP1, and mucin, and they may reduce uremic toxins by controlling the gut microbiota, improving the uremic condition. As such, long-term use of berry fruits could be an effective strategy for CKD patients.
Blueberry consumption significantly improves two-back test accuracy, suggesting potential cognitive benefits.
2023 CNS & Neurological Disorders - Drug Targets The Potential Effect of Blueberry on Cognitive Health and Mood State based on Human Intervention Studies: Systematic Review and Mini Meta-Analysis Soveid N, Barkhidarian B, Moradi S, Gholami F, Rasaei N, Himmerich H, et al.
Meta-Analysis Blueberry Cognitive Function
Methodology: A comprehensive search was conducted in April 2021 for relevant clinical trials on blueberry supplementation and its effects on cognitive performance and mood. The search was conducted through PubMed/Medline, Scopus, Embase, and Google Scholar, and the random effect size was used to estimate the pooled effect size. Cochrane Q test and I-squared tests were used to evaluate heterogeneity between studies, and a subgroup analysis was done to detect potential sources of such heterogeneity. Fourteen randomized trials were included in the quantitative analysis, and six were pooled for statistical analysis.
Results: Blueberry intervention did not produce any significant impact on mood state score, attention task reaction time, or on the percentages of attention task accuracy. Similarly, it had no significant effect on one-back test accuracy. However, a noticeable positive effect was detected in two-back test accuracy, indicating possible cognitive benefits associated with blueberry consumption.
Consumption of blueberry powder daily improves vascular function, cognitive abilities, and reduces blood pressure in healthy older individuals.
2023 The American Journal of Clinical Nutrition Wild blueberry (poly)phenols can improve vascular function and cognitive performance in healthy older individuals: a double-blind randomized controlled trial Wood E, Hein S, Mesnage R, Fernandes F, Abhayaratne N, Xu Y, et al.
Randomised Controlled Trial Blueberry Cardiovascular Disease Cognitive Function
This double-blind, parallel randomized controlled trial engaged 61 healthy older individuals aged between 65 to 80 years old. Participants were given either 26g of freeze-dried wild blueberry (WBB) powder, comprising 302 mg anthocyanins, or a similar placebo with zero mg anthocyanins. Measurements were made for endothelial function, cognitive function, arterial stiffness, blood pressure, cerebral blood flow, gut microbiome, and blood parameters, both at the start of the trial and again following 12 weeks of daily consumption. In addition, plasma and urinary polyphenol metabolites were analyzed through the use of microelution solid-phase extraction combined with liquid chromatography-mass spectrometry.
In the WBB group, there was a notable increase in endothelial function and a decrease in 24-hour ambulatory systolic blood pressure, when compared to the placebo group. Enhanced immediate recall on the auditory verbal learning task was also observed, along with better accuracy on a task-switch task following administering of WBB. Notably, the total 24-hour urinary excretion of polyphenols also significantly increased in the WBB group comparative to the control group. In contrast, there were no discernible changes in cerebral blood flow or gut microbiota composition. These findings imply that WBB polyphenols could contribute to reducing future cardiovascular disease risk in older populations, and might enhance memory processes and executive functioning in older adults at risk of cognitive decline.
The anthocyanins from the Gardenblue variety of blueberries exhibit strong antiproliferative effects on various cancer cells, especially liver cancer cells.
2023 Molecules The Extraction and High Antiproliferative Effect of Anthocyanin from Gardenblue Blueberry Zhao F, Wang J, Wang W, Lyu L, Wu W, Li W
Experimental Study Blueberry
65 varieties of blueberries were collected, focusing on their nutritional and functional values. Among these, the Gardenblue variety showed the highest anthocyanin content in fresh fruit. This content was further increased through the process of ultrasound-assisted solvent extraction and macroporous resin absorption, transforming it into a dried powder. Biological experiments were then conducted to determine the antiproliferative effects of Gardenblue anthocyanins on various cancer cell strains, such as cervical, liver, breast, and lung cells. Furthermore, these anthocyanins were combined with the chemotherapy drugs, cisplatin and doxorubicin, to assess any potential enhanced antiproliferative effects.
The research results confirmed that Gardenblue anthocyanins exert a substantial antiproliferative effect on multiple cancer cell types, particularly hepatoma or liver cancer cells. These anthocyanins displayed no evident toxic effects, as measured by the MTT assay, a laboratory colorimetric technique. Notably, the antiproliferative benefits were amplified when the anthocyanins were combined with doxorubicin, a treatment for liver cancer. Analysis suggests that the anthocyanins might induce cell apoptosis (cell death) by bonding with DNA in a manner that modifies or damages the DNA, thus preventing cell proliferation. This suggests potential application of Gardenblue anthocyanin extract as a functional agent against liver cancer cells.
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