TLDR
Many dementia cases might be delayed or prevented by improving education, blood pressure, hearing, exercise, smoking, alcohol use, head safety, air quality, and social connection. Good care can also help people with dementia and their families live better.
Summary
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1 Study Aim
The Commission aimed to update evidence on dementia prevention, diagnosis, treatment, and care since its 2017 report. The authors tested whether newer evidence supported adding risk factors to their life-course model, which examines risks from childhood through old age. They also aimed to recommend practical policies and personalised interventions for people with dementia and their carers. Dementia risk can be lowered by action throughout life, while supportive care can improve wellbeing after diagnosis.
2 Study Design
The international Commission used an interdisciplinary evidence synthesis, combining systematic reviews, meta-analyses (studies that statistically combine research results), randomised controlled trials (tests assigning participants by chance), cohort studies, and expert discussion. The authors searched research literature and conducted new meta-analyses for alcohol use and traumatic brain injury. They estimated each risk factor's population attributable fraction (PAF), meaning the share of cases linked to that factor. They used a UK sample of more than 10,000 community-dwelling adults to assess overlap between risks. Most available evidence came from high-income countries. The researchers combined many kinds of studies to estimate preventable risk and assess dementia care.
3 Findings
The study identifies 12 potentially modifiable risk factors: less education, hypertension (persistently high blood pressure), hearing loss, traumatic brain injury, obesity, heavy alcohol use, smoking, depression, physical inactivity, diabetes, low social contact, and air pollution. Together, they account for about 40% of worldwide dementias, assuming the relationships are causal. The authors recommend education, blood-pressure control, hearing aids, smoking cessation, safer environments, lower alcohol use, exercise, and cleaner air. They found no support for routine presymptomatic biomarker diagnosis. Person-centred psychosocial interventions (tailored non-drug support) can reduce behavioural symptoms, while carer programmes reduce distress. Dementia increases hospitalisation and delirium risk, so coordinated physical healthcare is essential. Prevention policies and personalised support could reduce dementia risk and improve daily life for affected families.