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Easy direct-to-patient ordering & fulfilment for Lifelong Wellness, eStoreRx™ is offered as part of the WholePractice membership or as a stand-alone program.
October 02 2024
Though it is well known that diet can certainly modulate the composition of the gut microbiota, we are only just beginning to understand how exercise ...
As summer winds down and the back-to-school season begins, blueberries remain a timeless, nutrient-packed treat perfect for topping yogurt, salads, or simply enjoying by hand. A growing body of research underscores the vast health benefits of blueberries (Vaccinium spp.), notably due to their robust antioxidant content.
The phenolic compounds of blueberries include flavonoids, resveratrol, anthocyanins, proanthocyanidins, and phenolic acids. The mechanisms of these various compounds involve neutralizing and scavenging reactive oxygen species (ROS); improving and regulating cellular health; enhancing the activity of endogenous antioxidant enzymes—glutathione peroxidase, superoxide dismutase (SOD), and catalase—while also influencing critical signaling pathways involved in ROS– such as the nuclear factor erythroid 2-related factor 2 (Nrf2) pathway—resulting in improved expression of antioxidant response and enhanced overall cellular resilience to oxidative stress.
These mechanisms are well supported by a 2022 study published in Advances in Nutrition. This study revealed blueberries' ability to modulate cellular mechanisms, demonstrating that their compounds mitigate oxidative damage in cell culture models via the NF-κB pathway.
A further 2017 double-blind, randomized and placebo-controlled study demonstrated the effects of blueberries on oxidative stress and the inflammatory process, while also modulating immune cellular levels in individuals with metabolic syndrome (MetS). Participants consumed either a blueberry (22.5 g freeze-dried) or placebo smoothie twice a day for six weeks. Results revealed that those consuming blueberry smoothies experienced significantly reduced levels of superoxide, total ROS, serum granulocyte-macrophage colony-stimulating factor (GMCSF9) and monocyte gene expression of tumor necrosis factor (TNFα), interleukin 6 (IL-6) and toll-like receptor 4 (TLR4). These findings demonstrate the possible immune-modulating properties of blueberries, while also underscoring their ability to attenuate oxidative stress and the body’s natural inflammatory process.
A subsequent 2018 study revealed that blueberry-derived phenolic acids enhance Nrf2-regulated antioxidant response in vascular endothelial cells. Researchers identified twelve aglycone phenolic acids in blueberries and found that these compounds—when utilized at physiologically relevant concentrations—significantly increased the expression of Nrf2-regulated antioxidant proteins in endothelial cells exposed to hydrogen peroxide (H2 O2). These results provide further evidence that blueberry-derived polyphenols may enhance cardiovascular health through their potent antioxidant mechanisms.
A previous (2014) randomized controlled trial investigating the effects of a single serving of blueberries on oxidative stress induced from smoking in sixteen male smokers, is in further support of these findings. Researchers found that blueberry consumption (300 g) counteracted the impairment in the reactive hyperemia index, Framingham reactive hyperemia, and the increase in systolic blood pressure following cigarette smoking.
A 2023 systematic review published in The Journal of Nutritional Biochemistry of 45 human intervention studies, demonstrated that blueberry consumption may improve markers of vascular function, with benefits observed from both immediate and long term consumption. These findings underscore the strong antioxidant effects of this nutritive fruit.
This subsequent 2021 randomized, double-blind placebo controlled trial assessed the effects of a daily 50-gram dose of freeze-dried highbush blueberry powder (BBP) on individuals with metabolic syndrome (MetS) over the course of eight weeks in adults at risk for the condition. Following BBP consumption, notable alterations were observed in the expression of 49 genes and the levels of 35 metabolites. Of further interest, differentially regulated genes were associated with immune-related pathways, suggesting the immune modulating properties of blueberries.
A 2021 systematic review of twenty-seven studies performed in animal models explored the connection between the effects of the phenolic compound, anthocyanin and the ability to improve intestinal health. The authors concluded anthocyanin supplementation demonstrated positive effects on GI health by an increase in microbiota phyla, Bacteroidetes and a reduction of Firmicutes, an increase in short chain fatty acid production (SCFA), tight junction proteins, goblet cells, and improved villi, in addition to reduced intestinal permeability. While this is an animal study, its extensive review provides compelling insights into how blueberries may support overall GI health, including overall microbiome composition, metabolites and intestinal barrier. Through these mechanisms, blueberries may further support immune health.
Another recent (2020) animal study published in The International Journal of Pharmaceutics demonstrated that blueberry-loaded injectable hydrogels significantly accelerated wound healing in rats. These hydrogels, made from carboxymethyl chitosan and oxidized hyaluronic acid, enhanced epithelial regeneration, supported a proper inflammatory process, and promoted collagen formation and blood vessel growth (angiogenesis), highlighting the potential implications of blueberry anthocyanins in promoting the natural healing of wounds.
A 2021 review showed that phenolic compounds of blueberries provide protection against skin cell damage induced by reactive oxygen species (ROS), underscoring their multifaceted antioxidant effects. Emerging findings also show promise on blueberries’ overall effects on cognitive health, as demonstrated in this 2020 review published in The Journal of Brain, Behavior & Immunity. Twelve studies were reviewed, involving freeze-dried blueberries (9 studies), whole blueberries (2 studies), and blueberry concentrate (1 study). These studies included children (5 studies), young adults (1 study), and older adults with either no known cognitive impairment (4 studies) or indicated cognitive impairment (2 studies). Eight of these studies reported improved measures of cognitive performance, including short-term, long-term and spatial memory.
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