Most kids love television and video games, but too much screen time can lead to problems.
"One of the biggest negative components of TV and video games is that it is sedentary and it is addictive," said Dr. Doug Klein, associate professor at the University of Alberta's Department of Family Medicine.
Time spent sitting in front of a screen is time spent not engaging in any sort of physical activity.
"Being sedentary adds to the issues around weight gain in children. There's also an opportunity for mindless eating, particularly with TV," Klein added.
It also has effects on concentration and sleep quality.
"There's a lot of work being done around concentration," said Klein. "ADHD is getting a lot of press. The jury is still out on the connections there."
Doctors recommend two hours or less per day of screen time (including computers), and unplugging for at least an hour before bed.
Despite the negative effects, there are ways to make screen time a positive family experience.
Klein recommends collaborative video games, engaging adults with children.
Adults need 150 minutes of moderate to vigorous exercise per week, which can be divided up. Kids need 60 minutes per day.