For many, winter weather means seasonal affective disorder. If you already live with depression, you might notice your symptoms worsen. Research now shows that exercise — as well as therapy and medication — can help. Catherine Sabiston, a University of Toronto professor, director of the Mental Health and Physical Activity Research Centre and Canada Research Chair in physical activity and mental health, explains how exercise can alleviate the signs of depression.

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Experts say that frequent use of social media is harming teens’ health, and the Australian government recently passed a law banning it for kids under 16. Here in Canada, Quebec is debating whether to follow suit. Psychiatrist and UBC associate professor of medicine Dr. Shimi Kang says rather than an all-out ban, parents should talk with their kids and figure out a plan that’s right for them.

H5N1 avian flu has now spread through dairy herds in 16 U.S. states. Close to 60 human cases have been reported in the U.S. and one here in Canada with a B.C. teen. Most have been caused through contact with infected animals, though a few sources are unclear. A new study in the journal Science says the virus might be just a single mutation away from more easily spreading between people. But infectious diseases specialist, Dr. Lynora Saxinger, says that while there’s no reason to panic, we need to take precautions and get any exposure to sick animals checked out.