Researchers at University College London looked at the activity levels of 4,257 12- to 16-year-olds.

Those who did an additional hour of light activity each day, such as walking or chores, had fewer depressive symptoms when they reached adulthood.

The study suggests people of all ages should be encouraged to move more.

The participants, from the University of Bristol's Children of the 90s cohort study, wore accelerometers for at least 10 hours on at least three consecutive days (except when they were washing or doing water sports) at the ages of 12, 14 and 16.

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