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Dementia Prevention: Evidence-Based Risk Factors
Introduction
What will remain after we defeat — or at least significantly reduce — cardiovascular disease and cancer?
That’s right: dementia and, more broadly, neurodegenerative diseases.
This is why dementia prevention is becoming one of the key challenges of future medicine.
Below is a summary of evidence-based, potentially modifiable risk factors for dementia identified by the Lancet Commission on Dementia Prevention, Intervention, and Care.
Potentially Modifiable Risk Factors for Dementia
- Lack of secondary education
Advanced education contribute to the development of cognitive reserve. Lifelong learning helps maintain and create new neural connections.
- Hearing impairment
Even mild hearing loss should be corrected with hearing aids. Untreated hearing impairment significantly increases dementia risk.
- Elevated LDL (“bad”) cholesterol
Statins do not cause dementia. However, high LDL cholesterol increases the risk of both vascular dementia and Alzheimer’s disease. LDL should be reduced through lifestyle and medication when appropriate.
- Depression
In older adults, depression can mimic dementia — a phenomenon known as pseudodementia.
- Head trauma
This includes motor vehicle accidents and contact sports such as American football, boxing, kickboxing, and soccer. Wearing helmets and preventing head injury are critical preventive strategies.
- Physical inactivity
Both aerobic and resistance exercise reduce inflammation in the brain. Aerobic exercise also increases production of BDNF, a molecule that supports neuronal growth and survival.
- Diabetes, obesity, smoking, hypertension
These are major vascular risk factors and drivers of chronic inflammation. They should be carefully controlled in collaboration with a physician.
- Alcohol consumption
Even small amounts of alcohol are associated with increased dementia risk.
- Social isolation
Social engagement helps preserve cognitive function. Family interaction, volunteering, church participation, and continued work activity can all be protective.
- Air pollution
Fine particulate matter (PM2.5) can penetrate the brain and promote inflammation.
- Vision loss
Added as a new risk factor in 2024. Reduced sensory input to the brain may accelerate cognitive decline.
Why This Matters
Research suggests that a significant proportion of dementia cases may be preventable by addressing modifiable risk factors across the lifespan. Education, cardiovascular health, physical activity, sensory health, and social engagement all play important roles in maintaining cognitive function.
Key Takeaway
Dementia is not an inevitable consequence of aging.
By addressing modifiable risk factors early and maintaining brain-healthy habits throughout life, individuals may significantly reduce their risk.
Read, learn, share — and help prevent dementia.