Millions of Americans have ‘mild cognitive impairment’ and don’t know it, experts say. How the condition relates to Alzheimer’s—and what you can do about it

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Nearly 7.5 million older Americans are predicted to have mild cognitive impairment (MCI)—a potential early sign of Alzheimer’s disease—but don’t know it.

That’s according to new research from the University of Southern California, whose researchers have recently published two papers on the topic.