Exercise seems to increase the production of a naturally occurring brain chemical with antidepressant effects, researchers reported on Sunday.

The findings, published in the journal Nature Medicine, point to potential new ways to treat Depression in people.

Studies have found that exercise can help ease Depression symptoms, but the reasons for the benefit have not been clear. For the new study, scientists used a tool called a microarray to examine how exercise changed gene activity in the brains of mice.

They focused on a brain region known as the hippocampus, which has been implicated in mood regulation and in the brain's response to antidepressant medication.............

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