Long considered a simple gourmet pleasure, this little blue berry is now establishing itself as a true health ally. And for good reason: research is accumulating and converging towards a clear observation: its regular consumption could act on several levels of the body, from blood circulation to memory, including intestinal balance. This ally is none other than the blueberry. Or cornflower.
A precious ally for the heart and vessels
Among the strongest conclusions from recent scientific work, cardiovascular health comes first. A major review of 12 clinical studies published in January, synthesizing more than two decades of research, indicates that consuming wild blueberries (a variety of blueberries particularly rich in active compounds) markedly improves vascular function.
Concretely, this means that the blood vessels relax better and respond more effectively to stimuli. Some studies even show measurable effects just a few hours after a serving, while others observe benefits after several weeks of regular consumption.
This phenomenon is largely explained by better availability of nitric oxide in the body, a molecule essential for good blood circulation and the prevention of cardiovascular diseases.
Clinical trials carried out in older adults have shown that daily consumption equivalent to approximately 180 g of berries for 12 weeks resulted in:
- A drop in blood pressure;
- Better dilation of the vessels;
- Potentially reduced cardiovascular risk.
A promising effect on memory and concentration
Blueberries also attract the attention of researchers for their effects on cognitive functions. Several studies indicate an improvement in working memory, concentration and attention skills after regular consumption.
In a controlled study, participants who consumed a wild blueberry powder drink for 12 weeks showed an 8.5% improvement in performance on attention tasks, as well as better cognitive accuracy. Their memory was also found to perform better than that of the placebo group.
Other research published in the journal Nutrients
go in the same direction: half a cup daily for three months helped improve lexical access, short-term memory and executive functions, in other words the ability to organize, plan and make decisions.
These effects could be explained by better cerebral blood circulation, but also by the anti-inflammatory action of its active compounds.
The secret of its benefits: anthocyanins
While blueberries are rich in fiber, vitamin C, vitamin K and manganese, experts agree that their real strength lies in their anthocyanins. These purple pigments, belonging to the polyphenolic flavonoid family, give it its intense color… and its remarkable properties.
Work from King’s College London showed that anthocyanins were responsible for a large part of the benefits observed, much more than other vitamins and minerals present in the fruit. These compounds act in particular against oxidative stress and inflammation, two factors involved in cellular aging and chronic diseases.
An unexpected impact on the intestinal microbiota
Another major discovery confirmed by the January scientific review: this berry could also play a key role in the balance of the intestinal microbiome.
Rich in fiber and polyphenols, it largely reaches the colon intact, where it is transformed by intestinal bacteria into active metabolites. The latter could represent up to 40% of the compounds circulating in the blood after consumption of foods rich in polyphenols.
A six-week clinical study notably observed an increase in beneficial bacteria of the genus
Bifidobacterium in participants consuming wild blueberry powder daily. Researchers even mention a “quasi-probiotic” effect on the intestine.
Comprehensive support for metabolism and blood sugar
Finally, beyond the heart and brain, research also suggests positive effects on metabolic health. Some studies indicate improved glucose management and insulin levels, a point of particular interest for people who are overweight or have insulin resistance.
Other work also shows benefits on blood lipids, cholesterol and triglycerides, although scientists are still calling for larger studies to confirm these long-term results.
Fresh, frozen or freeze-dried: all effective
Good news: the form of consumption doesn’t matter. Nutritionally, there are very few differences between fresh, frozen or freeze-dried blueberries. This makes them easy to incorporate all year round, in a smoothie, yogurt, porridge or salad.
According to researchers, around 200 grams per day would be enough to obtain substantial benefits, even if more modest quantities, consumed a few times a week, are already interesting. On the other hand, there is no need to consume in excess: the effects seem to stabilize around 240 grams.
A “superfruit”, yes… but not a magic wand
Despite its many benefits, blueberries should not be considered a miracle solution. Specialists point out that no food, on its own, can guarantee good cerebral or cardiovascular health.
Its interest lies rather in its ripple effect: regularly integrating this small fruit into your diet can encourage other positive habits, such as eating more fruits and vegetables rich in antioxidants (plums, apples, eggplant or red cabbage, also rich in anthocyanins).
Finally, certain precautions exist: due to its vitamin K content, people on anticoagulants must monitor their consumption, as do those suffering from intestinal disorders sensitive to fiber.