Three Habits, Thirteen More Years Without Dementia

Most advice about brain health is vague. Eat better. Stay active. Keep learning. All true, all hard to act on. A study published this month in Neurology Open Access offers something more concrete: three specific, measurable things, tracked in specific people, over a specific number of years, with a specific result attached.

The study

Researchers led by NYU Langone Health followed 12,409 adults enrolled in the long-running Atherosclerosis Risk in Communities Study, which began in 1986. Participants were on average 56 years old when the study period examined here began, and none had dementia at the start. The team tracked three midlife risk factors: high blood pressure, diabetes, and smoking. Then they followed these people for an average of 26 years.

Over that time, 3,008 participants developed dementia, and 5,238 died without ever developing it. The comparison that stands out: people with none of the three risk factors lived, on average, nearly 13 years longer without dementia than people who had all three — 30 years of dementia-free life from the study's start, versus 17.

Why blood pressure, diabetes, and smoking

All three damage blood vessels, including the ones that supply the brain. Chronically high blood pressure stiffens and narrows arteries. Diabetes does similar damage through elevated blood sugar. Smoking accelerates both processes. The brain depends on a dense, healthy network of small vessels to stay supplied with oxygen and nutrients — when that network is compromised over decades, the effects show up later as cognitive decline.

This is also why the researchers call these vascular risk factors rather than something more mysterious. They are not exotic. They are the same three things doctors have been measuring at checkups for decades.

What else the data showed

The study also looked at how these risks played out across groups. Women with all three risk factors still lived somewhat longer without dementia than men with all three — 18.1 years versus 16.6. And white participants with all three risk factors lived longer without dementia than Black participants with all three — 19.6 years versus 16.0, even after accounting for the same risk burden. The researchers noted this points to real disparities in how vascular risk translates into brain health outcomes, and that targeted prevention may matter most for the groups seeing the smallest benefit from the same risk reduction.

What the study does not show

This was an observational study, not an experiment. The researchers measured each person's blood pressure, diabetes status, and smoking habit once, at the start, and then tracked what happened over the following decades. That design cannot prove that avoiding these three things caused the extra 13 years — only that the two were strongly associated, in a large sample, over a long follow-up. People's health habits also change over time, and that single starting snapshot could not capture it.

It is also worth being precise about what "13 more years without dementia" means. It is an average across thousands of people, not a promise for any one person. Genetics, other health conditions, and factors the study did not measure all play a role too.

What this means for you

You cannot rewind to age 48, which is where the researchers pinpointed the most relevant window. But blood pressure, blood sugar, and smoking status are three things almost anyone can find out this year, with a routine check. Unlike a lot of brain health advice, these three have clear thresholds, established treatments, and doctors who already know how to help you address them. The senior researcher on the study put it simply: watch your vascular health closely, starting now, and if you smoke, this is one more solid reason to stop.

Small, steady mental engagement plays a role here too. Treeny's daily brain training with Flo is not a substitute for managing blood pressure or quitting smoking — but for the days when you are doing the things within your control, it is a way to keep the cognitive side active alongside the physical one.

This article discusses general research findings and is not medical advice. If you have concerns about your blood pressure, blood sugar, or any aspect of your health, please talk to your doctor.