Blueberries owe their deep blue color to anthocyanins, natural plant pigments that belong to the flavonoid family. These compounds are responsible for the purple, blue, and red shades found in many fruits and vegetables. Beyond their vibrant appearance, anthocyanins have long attracted scientific interest because of their potential health benefits.
According to a clinical study conducted by researchers at King’s College London, anthocyanin-rich blueberries may help lower blood pressure and improve blood vessel function, suggesting they could play a role in supporting cardiovascular health.
The Study
The researchers followed 40 healthy adults for approximately one month.
Half of the participants drank a beverage containing the equivalent of 200 grams (about 7 ounces) of blueberries each day. The other half received a control drink containing similar amounts of fiber, vitamins, and minerals but without the blueberry anthocyanins.
Throughout the study, participants underwent regular:
- Blood and urine tests
- Blood pressure measurements
- Assessments of blood vessel function, an important indicator of cardiovascular health
The Results
Positive effects began to appear after just two weeks.
By the end of the four-week study, participants who consumed the blueberry drink experienced:
- Lower blood pressure
- Improved function of the endothelial cells, which line the inside of blood vessels
- Better vascular function overall
Endothelial cells play a crucial role in regulating blood flow, controlling blood clotting, and maintaining healthy blood pressure.
Participants who consumed the control beverage did not experience the same improvements.
