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What country has the lowest rate of dementia?

Recent research in the journal *Alzheimer's & Dementia* highlighted that indigenous groups in the Bolivian Amazon have some of the lowest rates of dementia in the world, with only about 1% of older Tsimane and Moseten people affected. This contrasts sharply with high-income countries, where dementia prevalence is significantly higher, prompting an examination into what country has the lowest rate of dementia and the lifestyle and environmental factors involved.