Blueberry Concentrate Improves Brain Function in Older People
In the study, healthy people aged 65-77 who drank concentrated blueberry juice every day showed improvements in cognitive function, blood flow to the brain and activation of the brain while carrying out cognitive tests.
There was also evidence suggesting improvement in working memory.
Blueberries are rich in flavonoids, which possess antioxidant and anti-inflammatory properties.
The study gave people a daily drink of blueberry concentrate, providing the equivalent of 230g of blueberries
Dr Joanna Bowtell, head of Sport and Health Sciences at the University of Exeter, said: “Our cognitive function tends to decline as we get older, but previous research has shown that cognitive function is better preserved in healthy older adults with a diet rich in plant-based foods.
“In this study we have shown that with just 12 weeks of consuming 30ml of concentrated blueberry juice every day, brain blood flow, brain activation and some aspects of working memory were improved in this group of healthy older adults.”
Of the 26 healthy adults in the study, 12 were given concentrated blueberry juice – providing the equivalent of 230g of blueberries – once a day, while 14 received a placebo.
Before and after the 12-week period, participants took a range of cognitive tests while an MRI scanner monitored their brain function and resting brain blood flow was measured.
Compared to the placebo group, those who took the blueberry supplement showed significant increases in brain activity in brain areas related to the tests.
The study excluded anyone who said they consumed more than five portions of fruit and vegetables per day, and all participants were told to stick to their normal diet throughout.
Previous research has shown that risk of dementia is reduced by higher fruit and vegetable intake, and cognitive function is better preserved in healthy older adults with a diet rich in plant-based foods.
Flavonoids, which are abundant in plants, are likely to be an important component in causing these effects.
The new paper, “Enhanced task-related brain activation and resting perfusion in healthy older adults after chronic blueberry supplementation”, is published in the journal Applied Physiology, Nutrition and Metabolism.
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