Lancet study finds 45% of dementia cases could be prevented despite diagnosis delays

A Lancet study estimates that up to 45% of dementia cases could be prevented or delayed by addressing 14 modifiable factors, including smoking, high blood pressure, obesity, diabetes, hearing and vision loss, social isolation and limited education. Researchers emphasize that heart-healthy habits, regular exercise, improved diet, and treatment for hearing or vision problems may reduce cognitive-risk factors, even though aging and genetics remain important. At the same time, a major international trial is testing whether blood-based detection of Alzheimer’s-related changes and early treatment can prevent symptoms in otherwise healthy adults, but health systems such as the UK’s may lack the diagnostic capacity and infrastructure to implement such preventive care broadly. Current patients and families continue to face serious delays: nearly half of those seeking a dementia diagnosis reportedly wait more than six months, while some individuals endure years of misdiagnoses or uncertainty. Families and advocates say these delays worsen distress, financial strain, employment difficulties and care burdens, and leave people without treatment, support or a clear care plan.