Brain Health and Aging

Aging changes the brain, just as it changes the rest of the body.

We may need a little more time to remember a name, adjust to a new device, or move between several tasks. These moments can be frustrating, but they do not necessarily mean that something is wrong. A healthy older brain is not a young brain preserved unchanged. It is a living, adapting brain—one that continues to learn, reorganize, and build new connections.

There is no single food, supplement, puzzle, or morning routine that can guarantee lifelong cognitive health. Genetics, medical conditions, education, environment, opportunity, and chance all play a part. No one should be blamed for developing dementia, and healthy living is not a promise that illness will never come.

But the evidence does offer real encouragement: brain health is influenced by many of the ordinary things we do across a lifetime.

In 2024, the Lancet Commission identified 14 potentially modifiable factors associated with dementia risk, including high blood pressure, high LDL cholesterol, diabetes, smoking, physical inactivity, hearing and vision loss, depression, social isolation, and air pollution.¹ Updated World Health Organization guidance also emphasizes that supporting cognitive health is a lifelong effort involving individuals, healthcare systems, communities, and public policy—not personal willpower alone.²

The message is not "Do everything perfectly."

It is simpler and kinder:

Many small forms of care can support the brain, and it is never too early—or too late—to begin.

Move in ways your body can sustain

Physical activity is one of the most consistently supported habits for healthy aging.

Movement helps the heart and blood vessels deliver oxygen and nutrients to the brain. It supports blood pressure, blood sugar, sleep, mood, balance, and mobility. Exercise may also encourage biological processes involved in maintaining neural connections.

For many adults, public health guidelines recommend about 150 minutes of moderate activity each week, together with muscle-strengthening activities on at least two days.³ But this is a destination, not an entrance requirement.

A ten-minute walk counts. So does dancing in the kitchen, gardening, swimming, cycling, carrying groceries, or standing up regularly during a long afternoon. For an older adult, balance and strength exercises can be especially valuable because protecting mobility also protects independence.

If illness, pain, disability, or fatigue makes standard exercise targets unrealistic, the principle remains: move safely within your abilities. A physical therapist or healthcare professional can help adapt activity to your body.

The best form of exercise is rarely the most impressive one. It is the one you can return to.

Care for the heart to care for the brain

The brain depends on a healthy blood supply. Conditions that damage blood vessels can also affect memory and thinking over time.

Managing high blood pressure, LDL cholesterol, diabetes, and smoking is therefore not only cardiovascular care—it is brain care.¹² Regular checkups matter because these conditions may cause few noticeable symptoms while still affecting health.

This does not mean chasing perfect numbers without medical guidance. It means knowing your blood pressure, cholesterol, and blood sugar; taking prescribed medication consistently; discussing side effects; and asking what targets are appropriate for your age and circumstances.

It is also worth reviewing all medications with a clinician or pharmacist. Some prescription and over-the-counter medicines can affect alertness, sleep, balance, or memory, especially when several are taken together.⁴

Brain health is not separate from the rest of health. The same care that protects the heart, kidneys, and blood vessels often protects the brain as well.

Eat for nourishment, not perfection

Nutrition research is easily turned into dramatic headlines: one "brain food" is celebrated, another is blamed, and supplements are marketed as shortcuts.

The broader evidence is less exciting—but more useful.

Dietary patterns resembling Mediterranean or MIND-style eating are associated with better cardiovascular health and, in many studies, a lower risk of cognitive decline or dementia.²⁵ These patterns generally emphasize vegetables, leafy greens, beans, whole grains, nuts, fruit, olive oil or other unsaturated fats, and fish, while limiting heavily processed foods, excess salt, and large amounts of added sugar or saturated fat.

No individual ingredient carries the whole benefit. A bowl of berries cannot cancel years of uncontrolled hypertension, and a missed serving of vegetables does not damage the brain.

Think in patterns rather than rules.

Add beans to a soup. Keep fruit where it is easy to reach. Choose whole grains more often. Share a meal with someone when you can. Food supports the brain not only through nutrients, but also through routine, culture, pleasure, and connection.

For people with medical conditions, swallowing difficulties, limited income, reduced appetite, or special nutritional needs, individualized advice is more useful than a rigid diet.

Keep learning—but choose something meaningful

The brain remains capable of change throughout life. Learning and mentally engaging activities may help build what researchers call cognitive reserve: the brain's ability to cope with age-related or disease-related changes.

But "use your brain" does not mean everyone needs daily crossword puzzles or a commercial brain-training subscription.

Learning can take many forms:

• Practicing a language
• Learning a piece of music
• Cooking an unfamiliar recipe
• Joining a class or discussion group
• Reading and talking about what you read
• Repairing, building, sewing, painting, or gardening
• Learning how to use a new tool or technology
• Teaching someone else a skill you already have

The most helpful activity may be one that combines challenge, curiosity, and enjoyment.

Large trials have also examined several habits together rather than searching for one magic intervention. The Finnish FINGER trial found cognitive benefits from a two-year program combining physical activity, nutrition guidance, cognitive training, social participation, and management of vascular risks.⁶

The 2025 U.S. POINTER trial similarly found that both structured and self-guided multidomain lifestyle programs were associated with improved global cognition in older adults at increased risk of cognitive decline, with a modest advantage for the more structured program.⁷

These studies do not prove that a lifestyle program prevents dementia. They do suggest that several supportive habits, practiced together and reinforced by other people, can help protect cognitive function.

Protect hearing, vision, and connection

Hearing and vision are sometimes treated as separate from brain health. In daily life, they are deeply connected.

When hearing becomes difficult, conversation takes more effort. A person may participate less, misunderstand others, or quietly withdraw. Untreated vision loss can also reduce reading, mobility, activity, and independence.

The 2024 Lancet Commission includes both untreated hearing loss and vision loss among potentially modifiable dementia risk factors.¹ The ACHIEVE randomized trial found no overall cognitive benefit from a hearing intervention across its full study population, but it suggested benefit among participants at higher risk of cognitive decline.⁸ Hearing treatment also improves communication and quality of life, whether or not it changes dementia risk.

If conversations sound muffled, the television keeps getting louder, or reading and navigating have become more difficult, an assessment is worthwhile. Hearing aids, glasses, cataract treatment, better lighting, and communication strategies can help a person remain connected to the world.

That connection matters.

Loneliness and social isolation are associated with poorer health and a higher risk of cognitive decline, although association does not prove that loneliness directly causes dementia.¹⁹

Social health does not require a crowded calendar. One trusted friend, a weekly phone call, a faith community, a walking group, volunteering, or regular conversation with a neighbor can all be meaningful.

The goal is not to become more social than you naturally are. It is to have enough human connection to feel seen, useful, and part of something.

Make room for sleep and emotional health

Sleep is when the body and brain perform essential work. Poor sleep can affect attention, memory, mood, and decision-making the following day.

Observational research has linked persistently short sleep in midlife with a higher later risk of dementia, but these studies cannot prove that short sleep itself is the cause.¹⁰ Sleep disturbance can also be an early sign of illness, and the relationship between sleep and brain health probably works in both directions.

Rather than pursuing a perfect number of hours, pay attention to whether sleep feels restorative. Persistent insomnia, loud snoring, pauses in breathing, restless legs, or severe daytime sleepiness deserve medical attention.

Emotional health matters too. Depression is not an inevitable part of aging, and it can affect concentration, motivation, sleep, and memory. Treating depression may improve daily cognitive function and quality of life, even though no treatment can promise dementia prevention.

A healthy mind is not one that never feels sad, worried, or tired. It is one that receives care when those feelings become heavy.

Protect the brain from injury and harmful exposure

Seat belts, helmets, fall prevention, and safer sports practices protect more than the skull. Traumatic brain injury is associated with increased dementia risk, making prevention important across the lifespan.¹

Avoiding tobacco and limiting harmful alcohol use also support both vascular and neurological health.¹²

Some risks cannot be solved by individual choices. Air pollution, unsafe neighborhoods, limited access to healthcare, food insecurity, and lack of green space affect the opportunities people have to protect their health. Brain health must therefore be a community responsibility as well as a personal one.

Clean air, walkable neighborhoods, affordable hearing and vision care, social programs, education, and accessible medical treatment are all forms of dementia-risk reduction.

Start with one kind, realistic step

A long list of healthy habits can quickly become another source of anxiety.

You do not need to transform your life in a week.

Choose one step that fits the life you actually have:

Take a short walk after lunch. Make an appointment to check your hearing. Call someone you miss. Add one vegetable to dinner. Ask about your blood pressure. Return to a hobby that once absorbed you. Move bedtime a little earlier. Put a helmet by the bicycle so it is easy to remember.

When that step begins to feel familiar, consider another.

Brain health is not a test you pass or fail. It is a relationship with your future self—built through ordinary acts of attention over many years.

Some changes will be beyond our control. But there is dignity and hope in caring for what we can: the body that carries us, the people who connect us, and the mind through which we continue to meet the world.

Aging asks the brain to adapt.

With movement, nourishment, treatment, learning, rest, and companionship, we can give it meaningful support along the way.