What the Lund University Study Found About Modifiable Dementia Risks

A long-term study from Lund University has directly linked several common, modifiable health risks to the brain damage that leads to vascular dementia, the second most common cause of dementia after Alzheimer’s disease. Smoking, high blood pressure, cardiovascular disease and high blood lipids were each tied to faster deterioration of the brain’s white matter — the nerve fibres whose breakdown is a hallmark of vascular cognitive decline.

Nearly 500 adults with an average age of 65 and no signs of cognitive impairment were tracked for four years. Over that period, the researchers repeatedly measured white matter changes as well as the accumulation of amyloid β and tau, the two proteins that define Alzheimer’s disease. The goal was to see how both fixed risk factors — such as age and genetics — and factors people can influence mapped onto these distinct disease pathways.

The results showed a clear pattern: vascular damage accelerated in step with the number and severity of cardiovascular risk factors. “Most modifiable risk factors — smoking, cardiovascular disease, high blood lipids and high blood pressure, among others — were linked to damage to the brain’s blood vessels and a faster accumulation of white matter changes,” said Isabelle Glans, the study’s lead author. That damage, she explained, ultimately impairs blood vessel function and can lead to vascular dementia.

When the team examined Alzheimer’s-specific markers, the picture was different. Diabetes was associated with greater amyloid β buildup, while a lower body mass index was linked to faster tau accumulation. The researchers caution that these connections need further investigation before they are confirmed.

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Why Vascular and Alzheimer’s Pathways Respond Differently to Risk Factors

One set of habits, two different diseases

Until now, most public-health messaging has bundled all modifiable dementia risks together, implying that a single set of lifestyle changes works uniformly against all dementias. This study is one of the largest to show that the biological pathways are not the same. The four big cardiovascular risk factors — smoking, hypertension, heart disease and elevated lipids — appear to work primarily by damaging the small blood vessels that supply white matter. In contrast, metabolic factors such as diabetes and low body weight may influence Alzheimer’s protein pathology, though these links remain tentative.

Why the overlap still matters

Many people with dementia have mixed pathology — both vascular damage and Alzheimer’s changes in their brains. Therefore, even if controlling blood pressure or quitting smoking may not directly clear amyloid plaques, preserving vascular health can still delay the point at which symptoms appear. Senior author Sebastian Palmqvist noted that improving metabolic and vascular health is likely to remain valuable even for individuals already at risk of Alzheimer’s disease.

Causation versus association

The study is observational, meaning it can show links but cannot prove that changing a risk factor will prevent dementia. It is possible that underlying conditions both cause poor vascular health and independently promote white matter loss. Randomized trials that deliberately modify these risks are ethically and logistically difficult to run over the decades dementia takes to develop, so such longitudinal cohort data are currently the best guide available.

What the Findings Mean for Individuals and Health Systems

The study reinforces why population-level cardiovascular health remains a frontline defence against dementia. For people in midlife, the evidence supports several practical steps:

  • Smoking cessation: quitting smoking may directly reduce the rate of white matter damage that leads to vascular dementia, with benefits likely to accumulate the earlier the habit stops.
  • Blood pressure control: keeping systolic pressure within clinical guidelines appears to protect the brain’s small vessels; regular monitoring after age 40 is especially important.
  • Lipid management: elevated cholesterol and triglycerides were linked to faster white matter changes; working with a doctor to manage lipids through diet, exercise or medication could lower that risk.
  • Diabetes monitoring: the finding that diabetes was tied to greater amyloid buildup suggests that tight glucose control might influence Alzheimer’s pathology, though this connection needs confirmation.
  • For health systems: integrating brain health outcomes into routine cardiovascular programmes could make a material difference in future dementia prevalence; screening for multiple risk factors at once, rather than tackling them in isolation, mirrors how these risks act together in the brain.