Alzheimer's disease is the most common cause of dementia, affecting millions of people worldwide.
While age and genetics play a role, research shows that up to 45% of dementia cases may be linked
to factors you can change. That means the choices you make every day at any age can help protect
your brain.
This guide explains what the latest science tells us about reducing your risk.
It's Never Too Early — or Too Late
Brain health is a lifelong journey. Some protective steps matter most in early life (like education),
others in midlife (like managing blood pressure and weight), and still others in later life (like
staying socially connected). But no matter your age, there are meaningful actions you can take right now.
Key Steps You Can Take
Stay Physically Active
Regular exercise is one of the most powerful things you can do for your brain. Aim for at least
150 minutes per week of moderate activity such as brisk walking, swimming, cycling, or dancing.
Since 150 minutes (e.g. 30 minutes five times a week) is more than many can manage, know that any
amount is better than nothing! Exercise improves blood flow to the brain, reduces inflammation, and
supports the growth of new brain cells.
Eat a Brain-Healthy Diet
Diets rich in vegetables, fruits, whole grains, fish, nuts, and olive oil such as the Mediterranean,
MIND, or traditional indigenous diets, have been linked to better brain health. Try to limit red
and processed meats, fried foods, butter, pastries, and sugary drinks. These dietary patterns also
help manage weight, blood sugar, and cholesterol, all of which affect brain health.
Protect Your Heart
What's good for your heart is good for your brain. Work with your doctor to manage:
- High blood pressure (especially in midlife)
- High cholesterol
- Diabetes
- Obesity
These conditions, if left uncontrolled, can damage blood vessels in the brain and increase dementia risk.
Don't Smoke
Smoking damages blood vessels throughout the body, including in the brain. Quitting smoking at any age
reduces your risk of cognitive decline. Talk to your doctor about resources to help you quit.
Limit Alcohol
Heavy or excessive drinking increases dementia risk. If you drink, keep it moderate generally no more
than one drink per day for women and two for men. If you don't drink, there is no reason to start.
Get Quality Sleep
Sleep is when your brain clears out harmful waste products, including proteins linked to Alzheimer's
disease. Aim for 7–8 hours of quality sleep each night. If you snore loudly, stop breathing during sleep,
or feel excessively tired during the day, talk to your PCP as sleep apnea is treatable and may affect
brain health.
Stay Mentally Active
Challenging your brain helps build cognitive reserve
, a kind of mental resilience. Activities that help include:
- Reading, puzzles, or learning a new skill
- Taking a class or learning a new language
- Playing strategy games or musical instruments
Stay Socially Connected
Social isolation and loneliness are linked to higher dementia risk. Make an effort to:
- Stay in touch with friends and family
- Join community groups, clubs, or volunteer organizations
- Participate in group activities or classes
Protect Your Head
Traumatic brain injuries, even earlier in life, are associated with increased dementia risk. Wear
seatbelts, use helmets during sports or cycling, and take steps to prevent falls especially as you get older.
Remove tripping hazards at home and talk to your doctor about balance concerns.
Take Care of Your Hearing and Vision
Untreated hearing loss is one of the largest modifiable risk factors for dementia. If you notice
difficulty hearing, get your hearing tested. Hearing aids can help. Similarly, untreated vision
problems may also increase risk, so keep up with regular eye exams.
Manage Depression and Stress
Depression and chronic stress are associated with higher dementia risk. If you are feeling persistently
sad, anxious, or overwhelmed, reach out to your doctor. Effective treatments are available, and addressing
mental health is an important part of brain health.
The Power of Doing More Than One Thing
Research shows that combining multiple healthy habits has a much greater effect than any single change alone.
In one study, older adults who followed four or five healthy behaviors such as eating well, exercising,
staying mentally active, not smoking, and drinking only in moderation had a 60% lower risk of developing
Alzheimer's disease compared to those who followed zero or one.
The good news: these benefits were seen even in people with a genetic predisposition to Alzheimer's disease.
When to Talk to Your Doctor
See your doctor if you or a loved one notices:
- Increasing forgetfulness that disrupts daily life
- Difficulty with familiar tasks
- Confusion about time or place
- Trouble following conversations
- Changes in mood or personality
Early evaluation is important. While there is no guaranteed way to prevent Alzheimer's disease,
early detection allows for better planning, access to support services, and increasingly,
potential treatment options.
For Caregivers
If you are caring for someone with memory concerns or dementia:
- Encourage the healthy habits described above as this can help at any stage
- Help your loved one stay socially engaged and physically active
- Ensure they attend regular medical appointments
- Take care of your own health, too. Caregiver burnout is real, and support is available
- Ask your doctor about local caregiver support groups and resources
A Note of Hope
While Alzheimer's disease cannot yet be fully prevented, the science is clear: your daily choices matter.
By taking steps to protect your brain health today, you are investing in a healthier, more independent future.
Talk to your healthcare team about creating a personalized brain health plan that works for you.
References
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Barnes, L. L., Dhana, K., Liu, X., Carey, V. J., Ventrelle, J., Johnson, K., Hollings, C. S.,
& Sacks, F. M., et al. (2023). Trial of the MIND diet for prevention of cognitive decline
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