Dementia and Alzheimer’s disease are often thought to be mostly genetic, but research suggests lifestyle and health factors play a much larger role than many people realize. According to medical findings highlighted by The Lancet, up to 45% of dementia cases may be preventable by addressing certain risk factors that affect brain and cardiovascular health.
High LDL Cholesterol and Brain Health
One of the most commonly ignored risk factors is unmanaged LDL (“bad”) cholesterol. High cholesterol has long been associated with heart disease and stroke, but researchers now know it can also contribute to the buildup of amyloid and tau proteins in the brain, which are strongly linked to dementia. Experts recommend regular blood tests—especially after age 30—to monitor cholesterol levels and make early lifestyle changes if needed.
Uncontrolled High Blood Pressure
High blood pressure, often called the “silent killer”, frequently shows no symptoms while quietly damaging blood vessels throughout the body, including those in the brain. Studies suggest that untreated hypertension significantly increases the risk of developing dementia, while people who properly manage their blood pressure with medication or lifestyle changes may lower that risk substantially.
Untreated Hearing Loss
Hearing loss may seem unrelated to cognitive health, but research has found a strong association between hearing impairment and dementia risk. Experts believe part of the link may come from increased social isolation, depression, and reduced mental stimulation when people struggle to hear clearly. Addressing hearing issues early with hearing aids or medical care could help maintain both social engagement and cognitive health.
Vision Loss and Diabetes Management
Two additional factors doctors warn about are untreated vision loss and poorly controlled type 2 diabetes. Vision impairment has been identified as an independent risk factor for dementia, with studies suggesting people with vision loss may have up to a 50% higher risk of developing the condition. Meanwhile, poorly managed diabetes can damage blood vessels and affect brain health over time, making regular blood glucose monitoring and early treatment essential.