March 18, 2026
ByJoyce Hendley,
Staff Writer
- Reviewed byRobert H. Shmerling, MD,
Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing
Is there a single healthy diet to help keep your brain sharper as you age? New research from the Harvard T.H. Chan School of Public Health suggests there may be several.
In the study, published online Feb. 23, 2026, by JAMA Neurology, researchers reviewed data from three ongoing studies spanning several decades and involving 159,347 people (82.6% women). They ranked participants – whose average age was 44 when they enrolled in the studies – on how closely their diets followed each of six healthy diet patterns, including the Dietary Approaches to Stop Hypertension (DASH)-style diet, which emphasizes plant foods and limits sodium and sugar.
Then, they looked at how participants rated themselves on memory and attention abilities, as well as how some of them performed on standard cognitive function tests.
They found that all the diets were linked with significantly better cognitive functioning later in life – particularly DASH: participants whose diets most closely followed the DASH pattern had a 41% lower risk of self-reported cognitive decline compared with those with lowest DASH adherence. Cognitive function test results were also better among people with the healthiest diets. Evidence was strongest for those who were following a healthy diet in midlife (ages 45 to 54).
The study can’t prove the diets prevented cognitive decline, but it suggests that committing to healthy eating early on may yield brain health benefits later.
About the Author
Joyce Hendley,
Staff Writer
Joyce Hendley is a staff writer who contributes articles to Harvard Health Publishing’s flagship website and its four newsletters: the Harvard Health Letter, Harvard Heart Letter, Harvard Women’s Health Watch, and Harvard Men’s Health Watch. She …
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About the Reviewer
Robert H. Shmerling, MD,
Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing
Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. …
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View all posts by Robert H. Shmerling, MD
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