Black physicians are fascinated but not surprised by recent data that suggests Black people’s brains are likely to age faster than those of other races due to stressors such as racism. However, doctors said lifestyle changes and preventative care could help slow some of the decline.
In a study published last month in the journal JAMA Neurology, researchers from Columbia University found racial and ethnic disparities in brain markers of Alzheimer’s disease and related cases of dementia. The scientists analyzed MRI scans of nearly 1,500 participants, and found that Black adults in their mid-50s were more likely than white or Hispanic adults of the same age group to show white-matter lesions in their brains, which are indicators of cerebrovascular disease or cognitive decline.
The authors noted that “social forces” may have played a part in the accelerated brain aging seen among their Black subjects. In particular, the study says the weathering hypothesis — which states that “chronic exposure to social and economic disadvantage leads to accelerated decline in physical health outcomes”— could cause Black middle-aged adults on average to have cerebrovascular disease earlier in life.
JAMA Neurology did not immediately respond to request for interview.
Dr. Philippe Douyon, a neurologist in New Jersey at the Inle Brain Fit Institute who hosts The Brain Prophets Podcast, said he’s concerned that some may interpret the study to mean that Black people are naturally predisposed to Alzheimer’s. “That’s not the case at all. A lot of things contribute to dementia and Alzheimer’s, like high blood pressure and diabetes. Also, chronic stress kills neurons or brain cells in the part of the brain responsible for making new memories,” Douyon said.
He also noted that chronic stress as a result “of racism or health inequalities due to racism” can raise someone’s risk of developing cognitive disease. “But I would not want people to think that it has anything to do with the fact that the color of their skin is black,” he said.
Dr. Richard D. King, a neurologist and associate professor at the University of Kentucky College of Medicine, said many people who experience a deterioration in brain function do not realize there’s a problem until there’s been “quite a bit of decline.”
He added that stress can exacerbate hypertension, which can make a person more prone to cognitive decline.
“Elevated blood pressure is a very strong risk factor for worsening cerebrovascular disease,” King said. “But two people might respond to the exact same stress in very different ways. It’s a difficult thing to measure on an individual basis.”
Donald Grant, a psychologist and the executive director of Mindful Training Solutions, a firm that designs diversity, equity and inclusion programs for businesses, said the stress of being Black in America can wear on the brain.
“We’re talking about Black folks experiencing these higher degrees of racialized stress, meaning we’re watching ourselves being murdered through racism, we’re watching ourselves not get jobs because of racism,” Grant said. “We’re watching ourselves not get housing and equal opportunities through racism. That creates a unique stress that nobody else experiences and our brains are being impacted by it.”
Minimizing the risk
Douyon said there are many ways to slow brain aging, including maintaining a healthy diet and getting proper rest.
“You can minimize your risk of dementia by eating healthy — more fruits and grains and vegetables and less animal fats and sweets in moderation,” he said. “You need to make sure you’re getting six to eight hours of sleep every night.”
Douyon said sleep deprivation in someone’s mid-life years — 20s through 50s — can raise the risk of dementia in their 60s, 70s or 80s. He said it’s important to not only get sleep, but deep sleep, known as non-rapid eye movement (NREM) sleep.
“That’s when the brain essentially clears out the toxins that are developing throughout the day. And when these toxins build up, they develop into plaques and those are the kind of plaques that we see in people with Alzheimer’s,” he said.
King added that it’s also important to keep the mind and body active.