Poverty may dampen mental function and lead to premature brain aging in some people, a new study suggests.

The research included about 3,400 U.S. adults who were aged 18 to 30 at the start of the study in 1985-1986. The volunteers continued in the study until 2010.

At the end of the study, the participants underwent three standard tests to measure brain functions. The tests measured thinking, memory and processing speed.

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