Tiny amounts of lithium -- a natural metal -- may help protect the brain from Alzheimer's and signs of aging, new research shows.

Scientists at Harvard Medical School and Rush University found that when mice were fed a low-lithium diet, their brains developed more inflammation and signs of aging accelerated.

The findings were published Wednesday in the journal Nature.

Turns out, lithium may play a critical role in how the brain stays healthy, the researchers found.

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