A new study published in the Journal of Gerontology Series A has found that eating 200g of blueberries every day for a month can lead to an improvement in blood vessel function and a decrease in systolic blood pressure in healthy people.
Researchers from King's College London studied 40 healthy volunteers for one month. They were randomly given either a drink containing 200g of blueberries, or a matched control drink daily.
The team monitored chemicals in volunteers' blood and urine as well as their blood pressure and flow-mediated dilation (FMD) of the brachial artery: a measure of how the artery widens when blood flow increases, which is considered a sensitive biomarker of cardiovascular disease risk.
In a further study, researchers compared the effects of a blueberry drink with those of purified anthocyanins, a type of phytochemical responsible for the blue, red, pink and purple colour of some fruits and vegetables such as berries and red grapes. They also compared this with control drinks containing either similar levels of fibre, mineral or vitamins found in blueberries.
They found that:
Lead researcher Dr Ana Rodriguez-Mateos from the Department of Nutritional Sciences at King's College London said: "Although it is best to eat the whole blueberry to get the full benefit, our study finds that the majority of the effects can be explained by anthocyanins.
"If the changes we saw in blood vessel function after eating blueberries every day could be sustained for a person's whole life, it could reduce their risk of developing cardiovascular disease by up to 20%."
Materials provided by King's College London. Note: Content may be edited for style and length.
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