Scientists have long known that high blood pressure can damage the heart and blood vessels. But growing research now shows that it can also affect the brain.
A new study from researchers at Beijing Anzhen Hospital and several other institutions suggests that keeping blood pressure under control for a longer period of time may lower the risk of developing dementia later in life.
Dementia is not a single disease but a group of conditions that affect memory, thinking, reasoning, and daily functioning.
People with dementia may struggle to remember important information, follow conversations, solve problems, or complete everyday tasks. Alzheimer’s disease is the most common form of dementia, but there are several other types as well.
As the global population grows older, dementia has become a major public health concern. Millions of people around the world are living with the condition, and scientists are searching for ways to reduce the risk.
One factor that has attracted a lot of attention is blood pressure.
Blood pressure measures the force of blood pushing against artery walls as the heart pumps blood through the body. It is usually recorded using two numbers. The upper number is called systolic blood pressure, and it measures pressure when the heart beats. The lower number is called diastolic blood pressure, which measures pressure when the heart relaxes between beats.
When blood pressure stays too high for too long, it can damage blood vessels throughout the body, including those supplying blood to the brain. This damage may reduce blood flow, increase inflammation, and harm delicate brain tissues over time.
Previous studies have already linked uncontrolled high blood pressure to a higher risk of stroke, heart disease, and dementia. However, researchers behind this new study wanted to answer a more detailed question: does the amount of time a person’s blood pressure stays within a healthy target range affect their future dementia risk?
To investigate this, scientists used information from a large medical study called SPRINT, which stands for Systolic Blood Pressure Intervention Trial. This major study followed thousands of people with high blood pressure to examine how different treatment approaches influenced long-term health outcomes.
The researchers specifically focused on systolic blood pressure and tracked how consistently participants kept their numbers within the recommended target range over time.
Their findings were important.
The study showed that people whose systolic blood pressure remained within the healthy range for longer periods had a lower chance of developing probable dementia later on.
In fact, researchers found that for every 31.5% increase in the amount of time blood pressure stayed in the target range, the risk of dementia dropped by 16%.
This suggests that maintaining stable blood pressure over time may play a key role in protecting brain health as people age.
The researchers explained that blood pressure naturally changes throughout the day due to stress, physical activity, sleep, emotions, and many other factors. Because of this, a single blood pressure reading during a doctor’s visit may not fully reflect a person’s long-term blood pressure control.
Instead, what appears to matter most is consistency over months and years.
This finding is especially important because high blood pressure is extremely common. In the United States alone, nearly half of adults have hypertension, yet only about one in five people successfully keep it under control.
The good news is that blood pressure can often be improved through lifestyle changes and medical treatment.
Regular exercise is one of the most effective ways to lower blood pressure naturally. Physical activity strengthens the heart, improves blood circulation, and helps blood vessels stay flexible. Even simple activities like walking, swimming, cycling, or dancing can make a meaningful difference when done regularly.
Healthy eating also plays an important role. Diets rich in fruits, vegetables, whole grains, lean proteins, beans, fish, nuts, and healthy fats can help support both heart and brain health. Reducing excess salt, sugar, and highly processed foods may also help lower blood pressure.
Stress management is another important factor. Long-term stress may contribute to higher blood pressure levels. Relaxation techniques, social support, hobbies, mindfulness, and good sleep habits can all help the body recover from stress.
The researchers also highlighted that managing other medical conditions is very important for brain health. Diseases such as diabetes, high cholesterol, obesity, and heart disease can all increase dementia risk if left uncontrolled.
Keeping the brain active may provide additional protection as well. Activities like reading, learning new skills, solving puzzles, playing music, or engaging in social conversations help stimulate the brain and may support healthy aging.
Sleep is another major piece of the puzzle. During sleep, the brain clears waste products and restores important functions. Poor sleep over many years has been linked to memory problems and cognitive decline.
The researchers said their study reinforces the idea that brain health and heart health are deeply connected. Protecting blood vessels throughout the body may also help protect delicate blood vessels inside the brain.
Although more research is still needed, the message from the study is clear: keeping blood pressure within a healthy range consistently over time may reduce the risk of dementia and help people maintain better brain function as they grow older.
The research findings were based on data from the SPRINT study and were conducted by researchers from Beijing Anzhen Hospital and collaborating institutions.
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