How Do I Keep My Brain Sharp and Lower My Risk of Dementia?

Yes, You Can Protect Your Brain. Here Is What the Science Says.

If you have ever walked into a room and forgotten why, you have probably wondered whether your brain is starting to slip. The good news: researchers now believe that up to 45 percent of dementia cases worldwide are linked to modifiable risk factors, according to the 2024 Lancet Commission on Dementia Prevention, Intervention, and Care. That means your everyday choices, starting right now, can make a real difference.

This is not about miracle supplements or expensive gadgets. It is about practical habits that protect the brain you already have and help it build resilience for the years ahead.

What Does "Brain Sharp" Actually Mean?

When we talk about keeping your brain sharp, we mean preserving (and even improving) your ability to remember, reason, learn new things, and make decisions. The medical term is cognitive function. Cognitive decline is a gradual loss of these abilities. Dementia is a more severe decline that interferes with daily life, with Alzheimer's disease being the most common type.

Neuroplasticity is your brain's ability to form new connections throughout life. The strategies below work largely because they support neuroplasticity and protect the blood vessels that feed your brain.

Move Your Body: Exercise Is the Strongest Medicine

Physical activity is the single most evidence-backed way to lower dementia risk. The current recommendation from the U.S. Department of Health and Human Services is at least 150 minutes per week of moderate-intensity aerobic activity (like brisk walking, swimming, or cycling) plus two days of strength training.

Exercise increases blood flow to the brain, reduces inflammation, and promotes the release of growth factors that help brain cells thrive. A large meta-analysis published in the British Journal of Sports Medicine found that regular physical activity reduced dementia risk by approximately 28 percent.

In Oklahoma City, walking trails at Lake Hefner, the Oklahoma River Trails, and Mitch Park in Edmond offer free, accessible places to get moving year round. Many YMCA and senior center locations across the metro also offer classes designed for adults over 50.

Feed Your Brain: What to Eat (and What to Limit)

Two eating patterns have the most research behind them for brain health:

• The Mediterranean diet: rich in vegetables, fruits, whole grains, fish, olive oil, and nuts.
• The MIND diet: a hybrid of the Mediterranean and DASH diets, specifically designed to support brain health. It emphasizes leafy greens, berries, beans, whole grains, fish, poultry, and olive oil while limiting red meat, butter, cheese, pastries, and fried food.

A study from Rush University Medical Center found that people who closely followed the MIND diet had a 53 percent lower risk of developing Alzheimer's disease. Even moderate adherence was associated with about a 35 percent lower risk.

You do not need to overhaul your kitchen overnight. Start by adding one extra serving of leafy greens per day and swapping one red meat meal for fish or beans each week.

Stay Connected: Social Engagement Matters More Than You Think

Loneliness and social isolation are now recognized as significant risk factors for dementia. The National Academies of Sciences, Engineering, and Medicine reported that social isolation increases dementia risk by approximately 50 percent.

Staying socially active keeps your brain working: following conversations, reading social cues, remembering details about people's lives. It also reduces stress hormones that damage the brain over time.

Practical ways to stay connected include volunteering (Oklahoma City has a strong network through the Regional Food Bank of Oklahoma and Habitat for Humanity), joining a faith community, participating in a book club, or simply scheduling regular phone or video calls with friends and family.

Challenge Your Mind: Use It in New Ways

Mental stimulation builds what researchers call cognitive reserve, your brain's ability to improvise and find alternate ways to complete tasks even when some pathways are damaged. But there is a catch: doing the same crossword puzzle every day mostly makes you better at that puzzle.

The key is novelty and variety. Effective options include:

• Learning a new language (even with a free app like Duolingo)
• Taking a class at a local community college or through OLLI (Osher Lifelong Learning Institute) programs, available at the University of Oklahoma
• Learning to play a musical instrument
• Trying a new recipe or craft that requires following complex instructions

Manage the Medical Basics

Several common health conditions significantly raise dementia risk when left uncontrolled. Working with your doctor to manage these can protect your brain:

• High blood pressure: The SPRINT MIND trial showed that aggressive blood pressure control reduced the risk of mild cognitive impairment.
• Type 2 diabetes: Poorly controlled blood sugar damages blood vessels throughout the brain. Managing your A1C is a brain health strategy.
• Hearing loss: Untreated hearing loss is the single largest modifiable risk factor identified by the Lancet Commission. Getting your hearing tested and using hearing aids when recommended can reduce cognitive load and keep you socially engaged. Medicare Advantage plans in Oklahoma increasingly cover hearing aids, though Original Medicare generally does not.
• Depression: Chronic depression is both a risk factor for and an early symptom of dementia. Treatment helps on both fronts.
• Sleep disorders: Chronic poor sleep, especially untreated sleep apnea, is linked to higher dementia risk. During deep sleep, your brain clears out waste products, including amyloid proteins associated with Alzheimer's.

What About Supplements?

Despite heavy marketing, no supplement has been proven to prevent dementia in large, well-designed clinical trials. This includes ginkgo biloba, fish oil capsules, and most "brain health" supplement blends. The National Institute on Aging is clear on this point: save your money and invest in the lifestyle habits above instead. If you have a specific vitamin deficiency (like B12, which can cause memory problems), your doctor can test for it and recommend appropriate treatment.

Get Your Baseline: The Medicare Annual Wellness Visit

If you are 65 or older with Medicare, you are entitled to a free Annual Wellness Visit that includes a cognitive assessment. This short screening establishes a baseline so that changes can be detected early. Early detection matters because some causes of cognitive problems (thyroid disorders, medication interactions, vitamin deficiencies, depression) are completely reversible when caught.

Ask your primary care provider to include the cognitive screening at your next Annual Wellness Visit. If you are under 65 or uninsured, Oklahoma's SHIP (State Health Insurance Assistance Program) can help you understand your coverage options. Reach them at 1-800-763-2828.

Small Steps, Big Returns

You do not need to do everything at once. Pick one or two changes from this article and start this week. Walk for 20 minutes three times. Add a salad to your dinner. Call an old friend. Schedule that hearing test you have been putting off. Each of these small steps compounds over time, building a more resilient brain for the years ahead.

Want personalized guidance on brain health, caregiving support, or help navigating Medicare coverage for screenings and hearing care? Find a verified local expert through Second Half 365 who can help you take the next step with confidence.