New research is providing insight into how stress can shrink your brain cells and prematurely age your immune system. Essentially, the researchers say, stress can addle your mind and make you older. But there’s good news too: Exercise can make a huge difference. And, in the case of the brain at least, time might heal the wounds caused by stress.

“The brain is very resilient,” said Bruce McEwen, head of the neuroendocrinology laboratory at Rockefeller University in New York City. “Give it a chance and it will make every effort to repair itself.”

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