Adopting three key health behaviors in midlife—maintaining normal blood pressure, stable blood sugar, and abstaining from smoking—could delay the onset of dementia by an average of 13 years, according to a recent study from NYU Langone Health.
The research, which analyzed the medical data of over 12,000 individuals with an average age of 56, tracked participants for approximately 26 years. During this period, 3,008 individuals developed dementia.
Those who adhered to all three health markers experienced a diagnosis of dementia, on average, 13 years later than participants who exhibited all three risk factors. The study also noted that women, regardless of risk factors, tend to develop dementia later than men. Among participants with all three risk factors, women developed dementia 1.5 years later on average than men.
Previous research indicates that dementia is not an inevitable consequence of aging, and lifestyle choices can significantly reduce risk. Making healthy choices, such as regular exercise, a balanced diet, and weight management, has been shown to decrease dementia risk by over 45 percent.
Understanding Dementia Risk Factors
High blood pressure is recognized as a significant risk factor, affecting over 16 million people in the UK alone. This condition can damage blood vessels in the brain over time, impairing blood flow and oxygen supply. Left untreated, it can lead to small strokes, shrinkage in memory-associated brain areas, and white matter damage, contributing to vascular dementia.
Diabetes also poses a risk. Uncontrolled high blood sugar, insulin resistance, and damaged blood vessels can impair brain cell function, trigger chronic inflammation, and disrupt the clearance of toxic proteins linked to cognitive decline.
Smoking further exacerbates these risks by damaging blood vessels throughout the body and reducing blood flow. In the brain, this can accelerate shrinkage, especially in older age. Chemicals in cigarette smoke also cause blood to thicken and clot more easily, increasing the risk of stroke, a known precursor to dementia.
The study also observed that among participants with all three risk factors, white individuals tended to develop dementia 3.6 years later on average than Black participants. Researchers suggest that while vascular risk reduction may benefit all groups, targeted prevention efforts could be particularly beneficial for populations like Black adults.
Experts encourage individuals to focus on these preventable risk factors, especially from age 45 onwards. The Alzheimer's Society emphasizes that what is good for heart health is often beneficial for brain health. While no single action can guarantee prevention, approximately 45 percent of dementia cases worldwide could potentially be prevented or delayed by addressing modifiable health factors throughout life. The organization provides resources for those concerned about their dementia risk.