Several clinical studies suggest that eating blueberries can support brain function. One randomized trial in middle-aged adults at higher risk for dementia found that a small daily portion of blueberries improved tasks linked to executive function, which is the set of skills the brain uses for planning, focus, and self-management. Participants also reported fewer everyday memory problems. Researchers point to anthocyanins, the natural blue pigments in blueberries, as likely actors because they have antioxidant and anti-inflammatory effects that may help brain cells work better.
However, the evidence is not uniform. A more recent six-month randomized trial in adults with metabolic syndrome did not detect broad cognitive gains after blueberry intake, although a short-term rise in calmness was observed. Reviews of prior trials also note mixed results. Overall, blueberries appear helpful for some aspects of thinking in some groups, but they are not a cure for memory problems.
Blueberries may also benefit general health. Research links them with better markers of blood sugar control and with improved blood vessel function, both of which matter for long-term brain health. These supportive effects are a plausible pathway by which a blueberry habit could help protect thinking over time.
Nutrients – Blueberry Supplementation in Midlife for Dementia Risk Reduction – 2022
A randomized controlled trial in middle-aged, overweight adults with insulin resistance found that daily blueberry supplementation improved executive function measures and reduced self-reported memory encoding difficulties. Authors suggest anthocyanin-related mechanisms.
American Journal of Clinical Nutrition – Chronic and postprandial effect of blueberries on cognitive function, alertness, and mood in participants with metabolic syndrome – 2024
In a six-month double-blind randomized trial, blueberries did not produce broad improvements in cognition, mood, alertness, or sleep in adults with metabolic syndrome, though short-term calmness improved after a single blueberry dose. The authors conclude cognitive effects were not strong in this group.
Brain, Behavior, and Immunity – The effect of blueberry interventions on cognitive performance and mood: A systematic review of randomized controlled trials – 2020
This review of randomized trials reports heterogeneous methods and mixed outcomes, with some studies showing benefits to certain cognitive domains and others showing little to no effect, highlighting the need for larger, longer, and more consistent trials.
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