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Even 1 hour of exercise a week can help fight depression, expert says

NBC News medical contributor Dr. Natalie Azar joins Kathie Lee and Hoda to talk about the latest medical headlines, including a new study that shows that even small amounts of exercise can protect against depression. She also talks about new guidelines on mole removal to fight skin cancer, and research that shows adolescent girls may suffer concussion symptoms twice as long as boys.

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