Stressful life experiences can age the brain by several years, new research suggests. Experts led by a team from Wisconsin University’s school of medicine and public health in the US found that even one major stressful event early in life may have an impact on later brain health.
The team examined data for 1,320 people who reported stressful experiences over their lifetime and underwent tests in areas such as thinking and memory. The subjects’ average age was 58 and included 1,232 white Americans and 82 African Americans. A series of neuropsychological tests examined several areas, including four memory scores (immediate memory, verbal learning and memory, visual learning and memory, and story recall).
Stressful life experiences included things such as losing a job, the death of a child, divorce or growing up with a parent who abused alcohol or drugs. The results showed that a larger number of stressful events was linked to poorer cognitive function in later life.
When looking specifically at African Americans, the team found they experienced 60% more stressful events than white people during their lifetimes. Researchers said that, in African Americans, each stressful experience was equivalent to approximately four years of cognitive ageing.
The study, which has not been published in a peer-reviewed journal, was presented at the Alzheimer’s Association international conference in London.
Dr Maria Carrillo, the chief science officer for the Alzheimer’s Association, said: “The stressful events that the researchers were focusing on were a large variety … the death of a parent, abuse, loss of a job, loss of a home … poverty, living in a disadvantaged neighbourhood, divorce.” Even a change of school could be a stressful life event for some children, she said.
Dr Doug Brown, the director of research at the Alzheimer’s Society, said: “It remains to be established whether these stressful life events can lead to an increased risk of dementia.”