Harsh life experiences appear to leave African-Americans vulnerable to Alzheimer's and other forms of dementia, researchers reported Sunday at the Alzheimer's Association International Conference in London.

Several teams presented evidence that poverty, disadvantage and stressful life events are strongly associated with cognitive problems in middle age and dementia later in life among African-Americans.

The findings could help explain why African-Americans are twice as likely as white Americans to develop dementia. And the research suggests genetic factors are not a major contributor.

"The increased risk seems to be a matter of experience rather than ancestry," says Megan Zuelsdorff, a postdoctoral fellow in the Health Disparities Research Scholars Program at the University of Wisconsin-Madison.

Scientists have struggled to understand why African-Americans are so likely to develop dementia. They are more likely to have conditions like high blood pressure and diabetes, which can affect the brain. And previous research has found some evidence that African-Americans are more likely to carry genes that raise the risk.

Read the source article at npr.org