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Insufficient regular intellectual stimulation may reduce cognitive reserve — the brain's ability to maintain function despite age-related changes, vascular damage, and neurodegenerative processes.
Large-scale studies link low cognitive activity with a higher risk of dementia, earlier memory decline, and lower brain resilience to pathological changes.
Chronically elevated blood pressure can damage the brain's blood vessels, impair microcirculation, reduce neuronal nutrition, and accelerate structural changes in white matter.
Research shows that hypertension is one of the most significant modifiable risk factors for vascular dementia and Alzheimer's disease. Long-term high blood pressure increases the risk of stroke, microdamage in the brain, and gradual decline in memory, attention, and executive function.
Excess body fat, especially visceral fat around the abdomen, is associated with chronic inflammation, insulin resistance, impaired vascular function, and accelerated brain aging.
Studies show that obesity in midlife significantly increases the risk of dementia later in life, including Alzheimer's disease and vascular cognitive impairment. The key issue is not body weight alone, but the long-term metabolic dysfunction it may reflect.
Diabetes and prediabetes are linked to impaired glucose regulation, insulin resistance, chronic inflammation, vascular damage, and reduced energy metabolism in the brain.
Research shows that diabetes increases the risk of cognitive decline and dementia, especially vascular dementia. Insulin resistance is also considered one of the important mechanisms connecting metabolic disorders with Alzheimer's disease.
A persistently low emotional baseline, prolonged loss of interest, apathy, and depressive symptoms are associated with a higher risk of cognitive decline and dementia.
According to research, depression is one of the 14 modifiable risk factors for dementia. Possible mechanisms include chronic activation of the stress system, increased inflammatory load, sleep disruption, impaired vascular regulation, reduced neuroplasticity, and changes in the hippocampus — a brain structure critically important for memory.
Elevated LDL cholesterol, often called "bad" cholesterol, is associated with atherosclerosis, vascular damage, and reduced blood supply to the brain.
In the 2024 update of the Lancet Commission on dementia, high LDL cholesterol was added to the list of modifiable risk factors for dementia. The main mechanism is vascular damage: atherosclerosis, impaired microcirculation, increased stroke risk, white matter damage, and vascular cognitive impairment.
Excessive alcohol use is associated with damage to nervous tissue, reduced brain volume, impaired frontal lobe function, and worsening memory, attention, and executive function.
According to the Lancet Commission on dementia, excessive alcohol consumption is a modifiable risk factor for dementia. Studies link high alcohol intake with increased risk of dementia, vascular brain damage, and brain atrophy.
Smoking is associated with a higher risk of cognitive decline, vascular dementia, and Alzheimer's disease.
According to the Lancet Commission on dementia, smoking is a modifiable risk factor for dementia. The main mechanisms include vascular damage, chronic inflammation, oxidative stress, reduced oxygen delivery to tissues, increased stroke risk, and accelerated brain atrophy.
Physical inactivity is associated with a higher risk of cognitive decline and dementia.
According to the Lancet Commission on dementia, physical inactivity is a modifiable risk factor for dementia. The main mechanisms include poorer cerebral blood flow, reduced vascular elasticity, insulin resistance, chronic inflammation, reduced neuroplasticity, and weaker support of the hippocampus — a brain structure critically important for memory.
Air pollution is associated with a higher risk of cognitive decline and dementia.
Fine particles known as PM2.5 — particulate matter with a diameter of 2.5 micrometers or smaller — are especially important. These particles can penetrate deep into the respiratory tract, increase systemic inflammation, damage blood vessels, and trigger oxidative stress.
According to the Lancet Commission on dementia, air pollution is one of the 14 modifiable risk factors for dementia. Current research links long-term exposure to PM2.5, NO₂ — nitrogen dioxide — and other pollutants with a higher risk of dementia.
A lack of social contact is associated with a higher risk of cognitive decline and dementia.
According to the Lancet Commission on dementia, social isolation is a modifiable risk factor for dementia. Possible mechanisms include reduced cognitive stimulation, increased chronic stress, inflammatory load, depressive symptoms, poorer sleep, lower physical activity, and weaker engagement in preventive healthcare.
Traumatic brain injuries and significant blows to the head are associated with a higher risk of cognitive decline and dementia, especially after repeated injuries or more severe damage.
According to the Lancet Commission on dementia, head injuries are a modifiable risk factor for dementia. The main mechanisms include axonal damage — injury to the long projections of nerve cells — neuroinflammation, disruption of the blood-brain barrier, vascular changes, sleep disturbances, and gradual weakening of neural network resilience.
Significant vision loss is associated with a higher risk of cognitive decline and dementia.
According to the 2024 update of the Lancet Commission on dementia, untreated vision loss has been added to the list of modifiable risk factors for dementia. The main mechanisms include reduced sensory stimulation of the brain, increased cognitive load when processing information, reduced independence, lower physical and social activity, depressive symptoms, and weaker engagement with everyday life.
Significant hearing loss is associated with a higher risk of cognitive decline and dementia.
According to the Lancet Commission on dementia, hearing loss is one of the key modifiable risk factors for dementia. The main mechanisms include reduced auditory stimulation of the brain, increased cognitive load when recognizing speech, social isolation, depressive symptoms, and lower everyday engagement.
Studies also show that hearing aid use may help reduce the likelihood of dementia in people with hearing loss, especially when additional risk factors are present.