In an analysis published in JAMA Neurology on February 23, 2026, and reported by Powers Health, researchers examined the link between diet and brain aging.
The study is based on data from three large U.S. longitudinal studies involving more than 159,000 nurses and health professionals.
Participants’ dietary habits were assessed according to six different healthy dietary patterns.
The results were then compared with their self-assessments of memory and mental abilities in old age.
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The Importance of diet
An 11 to 24 percent lower risk of cognitive decline was observed among individuals who followed several of the healthy dietary patterns examined.
The strongest association was found with the DASH diet, which was developed to lower blood pressure.
Those who adhered most closely to this diet had a 41 percent lower risk of cognitive decline compared with those who adhered to it the least.
The effect was particularly evident among individuals aged 45 to 54.
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According to the research team, led by Kjetil Bjornevik from the Harvard T.H. Chan School of Public Health, higher intake of vegetables, fish, and moderate wine consumption was associated with better brain function.
In contrast, red and processed meat, fried potatoes, and sugary drinks were linked to poorer outcomes.
Heart and brain
According to dietitian Stephanie Schiff from Northwell Health, the explanation may be that healthy blood pressure protects blood vessels, including those supplying the brain.
High blood pressure can damage blood vessels and reduce oxygen supply to the brain, which over time may affect memory and thinking.
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The study therefore suggests that healthy eating habits in midlife may be an important part of maintaining brain health in old age.
Sources: Powers Health, and JAMA Neurology.
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