Amazon Communities Defy Dementia Patterns with Remarkably Low Rates

Two isolated communities in the Bolivian Amazon have remarkably low rates of dementia. Researchers from Arizona State University and the University of Southern California have been tracking the health of 730 adults in the Tsimané and Mosetén communities over five years, with surprising results.

The study found that fewer than 2% of participants developed dementia during this time period, a rate described as 'strikingly low'. This is compared to a three- to four-fold higher prevalence of dementia in the US and Europe. Age and genetics were identified as the strongest risk factors for developing dementia in these communities.

Researchers suspect that a subsistence lifestyle with low vascular risk factors may be contributing to this lower rate of dementia. However, they also found that many dementia patients showed parkinsonian symptoms and signs of vascular disease or stroke risk, rather than typical Alzheimer's patterns.