Researchers have discovered three specific health indicators during middle age that may significantly reduce the risk of developing dementia, potentially extending a person’s dementia-free lifespan by over a decade.
A study revealed that maintaining normal blood pressure, avoiding type 2 diabetes, and refraining from smoking between the ages of 45 and 65 could lead to an average increase of nearly 13 years without dementia. Additionally, the research indicated that women tend to live longer without dementia compared to men, and that white individuals generally experience more years free from dementia than their black counterparts.
This research was published in the esteemed medical journal Neurology and was conducted by scientists at NYU Langone Health. The team analyzed data from the Atherosclerosis Risk in Communities (ARIC) study, which began in 1986 and has followed participants into late adulthood, focusing on midlife vascular risk factors and dementia development.
In their latest analysis, the researchers examined 12,409 individuals, averaging 56 years of age, who did not have dementia at the start of the study. The participants were evaluated based on three risk factors: high blood pressure, type 2 diabetes, and smoking. They were monitored over approximately 30 years, with an average follow-up period of 26 years.
Over the course of the study, 3,008 participants were diagnosed with dementia, while 5,238 passed away without ever developing the condition. Those who did not present any of the three risk factors enjoyed nearly 13 more years free from dementia compared to those who exhibited all three risk factors.
Specifically, individuals who were free from diabetes, high blood pressure, and smoking at the beginning of the study had an average of 30.1 additional years without dementia. In contrast, those with one risk factor had an extra 26.3 years, those with two enjoyed 21 years, and participants with all three risk factors had just over 17 years free from dementia.
Dr. Josef Coresh, the senior investigator and director of the Optimal Aging Institute at NYU Langone, emphasized the importance of addressing these health factors in midlife to help preserve brain health for over a decade. He expressed hope that these findings would motivate individuals to quit smoking and monitor their vascular health beginning at age 45.
Globally, the number of people living with dementia is projected to nearly triple to 153 million by 2050. However, experts assert that nearly half of these dementia cases could be prevented or postponed.
Previous studies have indicated that addressing 14 modifiable risk factors throughout life could prevent or delay 45% of dementia cases, even as life expectancy increases. The NYU Langone research highlighted that the three identified factors typically arise in midlife and have enduring impacts on neurodegenerative diseases, stressing the importance of early detection and management.
Dr. Jacqui Hanley, who leads research funding at Alzheimer’s Research UK and was not involved in this study, noted that instead of merely assessing the likelihood of developing dementia, this research poses a vital question: how long can individuals expect to live without dementia? This perspective provides valuable insights into how midlife health influences the duration of dementia-free living while acknowledging the links between high blood pressure, diabetes, smoking, and increased risks of dementia and early mortality from other health issues.
Hanley urged the public to take proactive measures, such as engaging in regular physical activity, avoiding smoking, and managing health conditions like high blood pressure and diabetes. She concluded that while there is no surefire method to prevent dementia, studies like this one suggest that improving cardiovascular health may also help mitigate the risk of cognitive decline and dementia.
