Gen Z reports early cognitive decline. Here's what to know about the brain rot epidemic-and what to do about it

"This isn't a diagnosis of dementia or even of cognitive impairment. It's a subjective report of people saying they're having serious difficulty concentrating, remembering, or making decisions. With dementia, there's a structural brain disease and a specific pathology that's injuring the brain and leading to cognitive impairment."

"The younger cohort rate nearly doubled over a decade—from 5.1% in 2013 to 9.7% in 2023—driving most of the overall increase. By comparison, the rate among adults overall increased more modestly from 5.3% to 7.4% over the same period. The study tracked 4.5 million adults over 10 years."

"Because participants in the Yale study have not had their brains scanned, there's no way of knowing yet if they display the structural brain changes associated with dementia. Further research would be needed to determine if there is a link between early self-reported cognitive decline and the structural brain changes associated with dementia."

"That said, the Yale study notes that these findings should be investigated further, as growing cognitive problems among the population can pose future healthcare and workplace consequences. If such a link is established, it would pose a significant economic cost; a study published in Frontiers in Neurology notes that dementia cost the global economy $1.3 trillion in 2019."

Self-reported challenges with memory and thinking have become a leading health issue among U.S. adults. A 2025 study tracking 4.5 million adults over 10 years found cognitive disability rose from 5.3% to 7.4% overall, with the largest increase among adults ages 18 to 34. In that younger group, the rate nearly doubled from 5.1% in 2013 to 9.7% in 2023, accounting for most of the overall growth. The findings reflect subjective difficulty concentrating, remembering, or making decisions, not a diagnosis of dementia. Participants were not evaluated with brain scans, so structural brain changes linked to dementia are unknown. Further research is needed because rising cognitive problems could affect healthcare and workplaces, and dementia has major economic costs.

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