You probably know that forgetful moment when a name slips just as you reach for it. Most people shrug it off as a normal part of getting older. But what you put on your plate may play a bigger role in how sharp your memory stays than you think.
A 12-week trial published in the American Journal of Clinical Nutrition in 2023 followed 61 healthy adults aged 65 to 80.
Those who drank a daily blueberry powder drink did better on memory and attention tests than a placebo group.
They also saw a modest drop in their blood pressure. The study was led by researchers at King's College London and the University of Reading.
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The participants took 26 grams of freeze-dried wild blueberry powder each day. That is roughly the same as 178 grams of fresh berries, or about a cup.
What the trial actually measured
The blueberry group recalled slightly more words on an immediate memory test, 5.92 on average versus 5.28 for placebo. They were also around 8.5 percent more accurate on a task-switching exercise that measures attention and mental flexibility.
Over 24 hours, their top blood pressure number dropped by about 3.6 millimeters of mercury compared with placebo. Blood vessel function, measured by how well arteries open up, also improved slightly.
These are modest effects, not a cure for memory loss. But they add to a growing body of evidence that daily berry eating may nudge both brain and heart measures in a healthier direction.
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Why anthocyanins may matter
The researchers point to anthocyanins, the deep blue pigments that give blueberries their color. These compounds are a type of plant flavonoid.
Earlier research in both animals and humans suggests some anthocyanins reach the brain. There they appear to influence blood flow and signaling in memory-related areas.
The daily dose in the trial delivered roughly 302 milligrams of anthocyanins. Other foods carry the same family of pigments, including blackberries, red grapes, purple cabbage and strawberries.
What earlier research found
A separate randomized trial published in Nutrients in 2018 tested wild blueberry powder and a concentrated extract in 122 older adults over six months. The powder on its own did not improve memory scores.
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But a concentrated wild blueberry extract improved delayed word recognition at the three-month mark and lowered systolic blood pressure across the study, from about 122 to 116 millimeters of mercury.
The pattern across trials is more consistent on blood pressure than on memory, which is a reminder that fruit is not a prescription.
For readers interested in other foods tied to a sharper older brain, researchers have found similar signals in trials of walnuts.
How to work it into your day
A cup of fresh or frozen blueberries delivers a serving in line with the trial dose. Frozen berries hold their anthocyanins well and work in oatmeal, yogurt or a smoothie.
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If blueberries are not your favorite, other deeply colored fruits and vegetables are among the richest everyday sources of the same pigments.
A cup of blueberries runs about three to five dollars in US supermarkets and is widely available year-round in the frozen aisle.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.