Among lifestyle factors within our control, diet stands out as one of the most influential. A 2015 study by Rush University, published in the journal Alzheimer’s and Dementia, found that people who closely followed a brain-healthy diet had a 53% lower risk of Alzheimer’s disease, and even moderate adherence was associated with a 35% lower risk.

Best Foods for a Brain-Healthy Diet to Reduce Dementia Risk

A 2018 follow-up study published in the journal Neurology found that one daily serving of leafy green vegetables was associated with slower cognitive decline. Consuming flavonoid-rich foods such as berries reduced the risk of dementia by 28%.

Whole grains, especially less refined varieties—such as barley, quinoa, farro, and brown or wild rice—are emphasized in brain-health nutrition research. A 2023 study in the Journal of Prevention of Alzheimer’s Disease found that higher whole-grain intake was associated with a 28% lower risk of all-cause dementia and a 36% lower risk of Alzheimer’s disease.

Fish is frequently included in brain-healthy eating patterns because it provides protein and omega-3 fatty acids that support cognitive health. In 2024, researchers published a meta-analysis finding that higher fish intake was associated with a significantly lower risk of dementia and Alzheimer’s disease.

Olive oil has also been associated with better long-term brain health outcomes. A 2024 study from Harvard researchers found that consuming more than 7 grams of olive oil per day (about half a tablespoon) was associated with a 28% lower risk of dementia-related death, regardless of overall diet quality.

Foods to Limit for a Brain-Healthy Diet and Lower Dementia Risk
Just as important as adding more brain-supportive foods is reducing the foods most consistently linked to poorer long-term health outcomes.

Ultra-processed foods, for example, are linked to a higher risk of cognitive decline and dementia. A 2022 study published in the journal Neurology found that replacing 10% of ultra-processed foods with unprocessed or minimally processed foods was associated with a 19% lower risk of dementia.

There is also a strong correlation between dementia risk and greater alcohol intake. In genetic and observational research published in 2025, researchers from the University of Oxford, Yale University, and the University of Cambridge found that alcohol consumption at any level increases the risk of dementia, challenging earlier suggestions that light or moderate drinking could protect the brain.

Excessive sugar intake has also been linked with higher dementia risk. A 2024 study published in BMC Medicine examined the relationship between sugar intake and dementia risk and found that high-sugar dietary patterns were significantly associated with increased risk of all-cause dementia and Alzheimer’s disease.

How to Start a Brain-Healthy Diet for Dementia Prevention
Knowing what to eat is one thing. Putting it into practice is another, especially when habits have been in place for decades. The most sustainable approach is usually not a dramatic overhaul, but a series of small substitutions that gradually shift daily routines toward more brain-supportive foods.

Many people find it easier to focus on “adding” before “subtracting.”

• Adding leafy greens to one meal per day
• Incorporating berries a few times per week
• Choosing whole grains more often

These can improve overall diet quality without creating a sense of restriction. 

Simple meal “templates” can also make healthy choices more automatic. A breakfast built around oatmeal or whole-grain toast can easily include berries and nuts. Lunch can center on vegetables, lean protein, and olive oil-based dressing. Dinner can follow a consistent pattern of fish or poultry, vegetables, and a whole grain.

Another practical strategy is to make changes at the grocery store rather than at the dinner table. Keeping frozen vegetables and berries on hand, choosing whole-grain staples, and selecting minimally processed snacks make healthier options easier to reach for during busy weeks.

For many households, the most meaningful shifts come from replacing (not eliminating) favorite foods. Switching from white bread to whole-grain bread, replacing butter with olive oil for cooking, or choosing fruit or yogurt more often in place of packaged sweets are examples of realistic adjustments that can be sustained over time. The long-term goal is consistency, not perfection.

Finally, it is worth remembering that brain-healthy eating does not require extreme rules. Even moderate improvements, maintained over time, can be a meaningful step toward long-term cognitive health and a lower risk of dementia.