Relax: A new study shows that people with higher levels of the “stress hormone” tend to have smaller brains — but that doesn’t mean one causes the other.
The study, published today in the journal Neurology, reports smaller brain volumes and worse memories in people with higher-than-average levels of cortisol — popularly known as the stress hormone. But any media coverage that warns stress is going to shrink your brain is premature. “Right now all we can say is A is associated with B, we can’t really say anything about causality,” says Sudha Seshadri, a professor of neurology at the University of Texas Health Science Center at San Antonio and senior author on the study.
“The results are fascinating,” says Bruce McEwen, a neuroscientist...
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