A mix of factors are at play and greater awareness is needed, the researchers say.
The UCL research followed nearly 300,000 people who took part in the UK Biobank study for up to 14 years.
Despite the small number affected in black and South Asian groups, the study found that the same factors increased the risk of dementia in all three ethnic groups, Dr Naaheed Mukadam, study author and senior research fellow in psychiatry at UCL, said what lies behind a higher risk of dementia in black people was a "complex picture"."The difference means we need greater awareness in that population that dementia is a concern - and more proactive management of risk factors like hypertension, and more health checks.
Katherine Gray, research communications manager at Alzheimer's Society, said 25,000 people living with dementia were from ethnically diverse communities, with the number predicted to double by 2026.
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