The prospect of developing dementia frightens many people as they age, but emerging research brings encouraging news: nearly 45 percent of dementia cases may be prevented by addressing 14 evidence-based risk factors, many of which can be modified. New cases of dementia are estimated to double by 2060, but about 45 percent of those cases may be preventable by making lifestyle changes known to help preserve memory or cognitive function. While age remains the greatest risk factor for dementia and cannot be controlled, the choices people make throughout their lives significantly influence whether they will experience cognitive decline. Understanding which behaviors and conditions increase the risk of dementia and taking concrete steps to address them empowers individuals to protect their brain health. The strategies for reducing dementia risk require no expensive treatments or complicated interventions; instead, they rely on straightforward lifestyle modifications that most people can implement regardless of age or current health status. Making these changes not only reduces the risk of dementia but also improves overall health, quality of life, and independence as people age.
Get Regular Physical Activity
If you exercise regularly, you may be up to 20 percent less likely to develop dementia than people who don’t, with exercise enhancing blood flow and sending oxygen and nutrients to the brain. Physical activity represents one of the most powerful tools available for protecting brain health, with benefits extending beyond cardiovascular fitness to directly support cognitive function.
Regular exercise and about seven hours of sleep a night could protect brain health in the long term, with studies showing that regularly being active, even just going for a walk every day, decreased dementia risk by an average of 25 percent. This substantial risk reduction makes exercise one of the most effective interventions for dementia prevention, rivaling or exceeding the benefits of many medical treatments.
The type and amount of exercise matter. Aerobic activities such as walking, swimming, cycling, or dancing that elevate heart rate and breathing provide the greatest cognitive benefits. These activities increase blood flow throughout the body, including to the brain, delivering oxygen and nutrients that brain cells need to function optimally. Aerobic exercise also stimulates the release of growth factors that promote the formation of new blood vessels in the brain and the survival of new brain cells.
Strength training provides complementary benefits by building muscle mass that supports metabolism and physical independence. Combining aerobic exercise with strength training creates comprehensive fitness that protects both body and brain. Even modest amounts of activity provide benefits, with 20 to 30 minutes of moderate-intensity exercise most days of the week meeting recommended guidelines.
Starting an exercise program at any age provides cognitive benefits. While maintaining physical activity throughout life offers the greatest protection, people who begin exercising in middle age or even later still gain significant benefits for brain health. The key is consistency, as regular ongoing activity produces better results than sporadic intense workouts.
Avoid Excessive Sitting and Break Up Sedentary Time
Sitting for more than eight hours a day increased dementia risk by almost 30 percent, and long periods of sitting can increase a person’s propensity to cardiovascular disease, diabetes, and obesity, all of which raise dementia risk. The harm from prolonged sitting occurs even among people who exercise regularly, making it essential to address both exercise and sedentary behavior separately.
Many people assume that being physically active cancels out the harm of sitting for long periods, but it doesn’t; exercising before work and then sitting for eight hours or more can erase some of the brain benefits of exercise. This means that a morning workout, while beneficial, does not fully protect against the damage caused by sitting all day at work.
Breaking up long periods of sitting with standing or walking can improve blood flow to the brain. The brain has very small capillaries, and when blood flow is reduced to these tiny pathways, it can create the foundation for brain atrophy. Standing up every 30 to 60 minutes, walking to get water, taking brief movement breaks, or using standing desks helps maintain blood flow and reduces the cardiovascular risks associated with prolonged sitting.
For people whose jobs require extensive sitting, making deliberate efforts to incorporate movement throughout the day becomes essential. Taking phone calls while walking, using stairs instead of elevators, parking farther from entrances, or scheduling walking meetings all reduce total sitting time. Even small movements such as stretching, shifting positions, or doing simple exercises at the desk help maintain circulation.
Engage in Mentally Active Behaviors
Replacing an hour of mentally passive behavior with mentally active behavior decreased dementia risk by 7 percent, and combining physical activity with active mental behavior decreased the risk by 11 percent. The type of activity the brain engages in during sedentary time significantly affects dementia risk, with mentally active sitting protecting against cognitive decline while passive sitting increases risk.
Sitting alone in front of the television or mindlessly scrolling on social media isn’t great for mental or physical health, with new research suggesting that these mentally passive habits might increase dementia risk. The brain works like a muscle, and not actively using it for extended periods can eventually negatively affect the parts linked to memory and learning.
Mentally active sedentary behaviors include reading, solving puzzles, playing strategy games, knitting, learning new skills, engaging in hobbies that require concentration, or participating in stimulating conversations. These activities challenge the brain, maintain neural connections, and build cognitive reserve that protects against decline.
A specific cognitive training regimen that challenged participants with rapid object-detection tasks was associated with a 25 percent lower rate of dementia diagnosis over 20 years, suggesting that simple brain training for just weeks may help people stay mentally healthy for years longer. The training involved 60- to 75-minute sessions twice a week for five to six weeks, focusing on visual processing speed, demonstrating that even limited cognitive training can produce long-lasting protective effects.
Lifelong learning and intellectual engagement provide ongoing cognitive stimulation. Taking classes, learning new languages, pursuing creative activities such as music or art, or engaging with challenging reading material all help maintain cognitive function. The key is regular mental stimulation that challenges the brain rather than passive consumption of entertainment.
Get Adequate Quality Sleep
The sweet spot for brain health was between seven and eight hours of sleep each night, with sleeping fewer than seven hours increasing dementia risk by 18 percent and sleeping more than eight hours increasing it by 28 percent. Sleep plays a crucial role in brain health, including memory consolidation, clearing metabolic waste products, and supporting neural repair.
Sleep quality matters as much as sleep duration. Deep sleep stages facilitate the removal of beta-amyloid, a protein that accumulates in the brains of people with Alzheimer’s disease. Disrupted sleep prevents this cleaning process, allowing harmful proteins to build up over time. Sleep apnea, a condition where breathing repeatedly stops during sleep, severely disrupts sleep quality and independently increases dementia risk.
Improving sleep starts with establishing consistent sleep schedules, going to bed and waking at the same times each day, including weekends. Creating dark, quiet, cool sleeping environments optimizes conditions for quality sleep. Avoiding caffeine in the afternoon and evening, limiting alcohol,l which disrupts sleep architecture, and reducing screen time before bed all support better sleep.
People experiencing persistent sleep problems, such as difficulty falling asleep, frequent nighttime awakenings, or daytime sleepiness despite adequate sleep time, should discuss these issues with healthcare providers. Sleep disorders such as insomnia and sleep apnea require treatment to protect both immediate well-being and long-term brain health.
Control Blood Pressure
In a study published in Nature Medicine in 2025, intensive blood pressure control to achieve a blood pressure of 130 over 80 lowered the risk of dementia by 15 percent. High blood pressure damages blood vessels throughout the body, including those in the brain, limiting blood flow and causing damage that accumulates over the years.
Hypertension in midlife, typically defined as ages 40 to 65, is particularly significant for dementia risk. Elevated blood pressure during these critical years causes cumulative vascular damage that manifests as cognitive decline decades later. Controlling blood pressure during midlife provides greater long-term cognitive benefits than controlling it only in late life, though blood pressure management at any age helps.
Lifestyle modifications can significantly lower blood pressure. Regular exercise, maintaining a healthy weight, reducing sodium intake, eating diets rich in fruits and vegetables, limiting alcohol, and managing stress all contribute to blood pressure control. When lifestyle changes prove insufficient, medications effectively lower blood pressure and reduce the risk of dementia.
Many people with high blood pressure experience no symptoms, making regular blood pressure checks essential. Home blood pressure monitoring allows tracking of readings over time and helps identify white-coat syndrome, in which blood pressure rises only in medical settings. Working with healthcare providers to achieve and maintain healthy blood pressure represents one of the most important steps for protecting brain health.
Manage Diabetes and Blood Sugar
Diabetes increases dementia risk through multiple mechanisms, including blood vessel damage, inflammation, and direct effects of high blood sugar on brain cells. When diabetes is not managed properly, too much sugar in the bloodstream damages important organs,s including the brain. Type 2 diabetes, which accounts for about 90 percent of diabetes cases, can be prevented or delayed through lifestyle changes.
Maintaining a healthy weight through balanced eating and regular physical activity helps prevent or delay type 2 diabetes in most people at risk. For those already diagnosed with diabetes, keeping blood sugar levels within target ranges through medication, diet, exercise, and regular monitoring reduces complications, including cognitive decline.
Prediabetes, a condition where blood sugar levels are elevated but not yet in the diabetic range, provides an important warning and opportunity for intervention. People with prediabetes can often prevent progression to full diabetes through weight loss, increased physical activity, and dietary improvements, thereby also reducing future dementia risk.
Address Hearing Loss
Hearing loss is a major risk factor for dementia, with researchers believing that it may make the brain work harder,r at the expense of thinking and memory. Treating hearing loss with hearing aids has been shown to reduce the risk of dementia to the level seen in people with normal hearing.
Hearing loss leads people to be less socially engaged, which removes important intellectual stimulation. The social isolation resulting from difficulty hearing and participating in conversations reduces cognitive stimulation that helps maintain brain health. Additionally, the brain must work harder to process degraded auditory signals, potentially diverting resources from memory and other cognitive functions.
Many people delay addressing hearing loss out of embarrassment or reluctance to wear hearing aids. This delay allows years of cognitive strain and social withdrawal that increase dementia risk. Modern hearing aids are smaller, more effective, and less visible than older models, and over-the-counter options have made them more accessible and affordable.
Regular hearing tests help identify hearing loss early when intervention provides maximum benefit. Protecting hearing by avoiding loud noises, using ear protection in noisy environments, and keeping music and headphone volumes at safe levels preserves hearing function throughout life.
Correct Vision Problems
Vision impairment increases dementia risk, but people who have corrected vision loss do not have an increased risk of developing dementia. This distinction highlights that vision correction through glasses, cataract surgery, or other treatments effectively eliminates the dementia risk associated with poor vision.
Vision loss may increase the risk of dementia through mechanisms similar to those of hearing loss, including reduced social engagement, decreased physical activity due to fear of falls, and cognitive strain from difficulty perceiving the environment. Vision problems can also make it harder to engage in mentally stimulating activities such as reading or hobbies.
Regular eye exams detect vision problems and allow timely correction. Cataracts, a common cause of vision loss in older adults, can be successfully treated through surgery that restores clear vision. Other vision problems, such as glaucoma, macular degeneration, and diabetic retinopathy, require ongoing treatment to preserve vision.
Taking care of vision problems promptly, updating eyeglass prescriptions as vision changes, and seeking treatment for eye conditions protects both quality of life and cognitive function.
Maintain Social Connections
Social isolation and loneliness significantly increase dementia risk. Social contact in any form may reduce the risk of dementia by increasing cognitive reserve, brain volume, and healthy behaviors, while reducing stress and inflammation. Engaging in social activities helps build the brain’s ability to relieve stress and improve mood.
Meaningful social connections provide intellectual stimulation through conversations, shared activities, and exposure to diverse perspectives. Social engagement encourages people to leave home, maintain personal appearance, and participate in activities they might otherwise skip. The cognitive demands of social interaction, reading social cues, and engaging in reciprocal communication all exercise brain functions.
Maintaining social connections requires deliberate effort, particularly for people who live alone, have lost spouses or friends, or have limited mobility. Joining clubs, attending religious services, volunteering, participating in group exercise classes, or taking classes all create opportunities for social engagement. Technology enables social connection through video calls and messaging for people unable to meet in person.
Quality of social connections matters more than quantity. Deep, meaningful relationships with a few close friends or family members provide greater cognitive and emotional benefits than superficial interactions with many acquaintances. Investing in relationships, staying in touch with loved ones, and making time for social activities protects brain health.
Avoid Excessive Alcohol and Quit Smoking
Drinking too much alcohol increases dementia risk. Excessive drinking can lead to high blood pressure or brain injuries, both of which increase dementia risk. Current recommendations suggest drinking no more than 14 units of alcohol each week, equal to about one pint of beer or a small glass of wine each day. Regularly drinking much more than this increases the risk of damage to the brain and other organs.
Smoking puts people at much higher risk of developing dementia later in life. Smoking harms the circulation of blood throughout the body, particularly in the blood vessels of the brain, heart, and lungs. The earlier people stop smoking, the more brain damage they avoid, and it is never too late to quit.
Current smoking increases the risk of developing dementia, including Alzheimer’s disease. Quitting smoking also reduces other dementia risk factors such as stroke, type 2 diabetes, and high blood pressure. The combination of these benefits makes smoking cessation one of the most impactful steps for reducing dementia risk.
Manage Depression
Depression likely represents a risk factor for dementia. When people feel low, anxious, or irritable over extended periods, they should talk to healthcare providers or contact mental health organizations. Seeking help early when depression symptoms first appear prevents progression and reduces associated dementia risk.
Depression affects brain structure and function, potentially contributing to cognitive decline. The social withdrawal, physical inactivity, poor sleep, and neglect of health that often accompany depression create conditions that increase dementia risk. Additionally, depression may represent an early symptom of developing dementia rather than only a risk factor.
Treatment for depression through therapy, medication, or combination approaches improves mood, function, and potentially reduces dementia risk. Regular screening for depression by healthcare providers helps identify cases that individuals might not recognize or report spontaneously.
Protect Your Head from Injury
Traumatic brain injury increases dementia risk, making head injury prevention an important protective strategy. Taking steps to prevent falls and head injuries, such as fall-proofing homes and wearing shoes with nonskid soles that fully support the feet, reduces injury risk.
Wearing protective headgear in situations with a higher-than-normal risk of head injury, such as riding bicycles, working on construction sites, horseback riding, or playing contact sports, protects against traumatic brain injuries. Helmets must fit properly and meet safety standards to provide effective protection.
Coaching staff in contact sports should know how to recognize and properly manage concussions and other head injuries. While more research is needed to fully understand the long-term dementia risk from repeated head impacts in sports, proper concussion protocols reduce immediate and long-term injury risks.
Maintain a Healthy Weight and Eat Well
Obesity, particularly in midlife, increases dementia risk. Eating an unhealthy diet may cause health problems, including obesity, which can be linked to increased dementia risk. Mediterranean-style diets rich in vegetables, fruits, whole grains, fish, nuts, and olive oil show particular promise for brain health.
Maintaining a healthy weight through balanced eating and regular physical activity addresses multiple dementia risk factors simultaneously. A healthy weight reduces the risks of diabetes, high blood pressure, heart disease, and stroke, all of which contribute to cognitive decline.
Specific dietary patterns that emphasize plant foods, healthy fats, and limited processed foods support both cardiovascular and brain health. While no single food prevents dementia, overall dietary patterns that provide nutrients, antioxidants, and healthy fats while limiting excess calories, saturated fat, and added sugars create conditions that support cognitive function.
The Power of Cumulative Changes
It makes sense to work on as many risk factors as possible, even if it means taking one step at a time, with some noting that if we could package these interventions into a pill, it would be wildly successful. The encouraging reality is that these lifestyle modifications do not require prescriptions, expensive treatments, or complicated procedures. They represent choices and behaviors that most people can implement with varying degrees of effort and support.
Starting with one or two changes and building from there creates sustainable progress. Someone might begin by adding daily walks, then work on improving sleep, then address hearing loss, gradually accumulating protective behaviors over time. Each positive change reduces dementia risk and often improves the current quality of life, creating motivation to continue.
The impact of addressing multiple risk factors compounds, with people who modify several risk factors experiencing greater risk reduction than those addressing only one or two. This cumulative effect means that even modest improvements across multiple areas produce meaningful protection against cognitive decline.
While dementia cannot be entirely prevented, and some people will develop it despite healthy lifestyles, the evidence clearly shows that lifestyle choices profoundly influence dementia risk. Taking steps to protect brain health represents an investment in future independence, quality of life, and the ability to remain engaged with loved ones and activities that bring meaning and joy.
