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DALLAS (CNN) — Parents, there's yet another reason to limit screen time for your kids: It could contribute to future heart disease.
The latest advice comes from the American Heart Association, and reinforces existing recommendations to limit screen time for children and teens to no more than one to two hours a day.
"Screen time is associated with being overweight and obese which is associated with high cholesterol and high blood pressure," said pediatric cardiologist Dr. Stephen Daniels, a spokesman for the American Heart Association. "Once those risk factors, such as obesity, are in play in childhood, they tend to continue into adulthood."
Dr. David Hill, chairman of the Council on Communication and Media for the American Academy of Pediatrics, agreed: "Heart health starts during childhood, so I think it's very appropriate that the American Heart Association looks at every issue that can contribute to heart disease."
A panel of American Heart Association experts reviewed 20 years of science on the relationship between cardiovascular disease, stroke and self-reported screen time by children and teens. They found that while TV viewing is down, the use of mobile screens is up, resulting in an overall net increase.
Today, kids age 8 to 18 are estimated to spend more than seven a hours a day on smartphones, tablets, video games and other screen-based recreational devices, including television.
While time spent being a sedentary TV couch potato might be down, the use of other types of more portable screens doesn't seem to be increasing activity among youth, the expert panel said.
"Passive viewing is still children's number one activity," Hill said. "Whether it's a video game, or laptop or desktop computer, children are still sitting."
Since sedentary behavior is linked to obesity risk, and obesity is linked to heart disease, it doesn't take a detective to figure out the connection.
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The amount of time young children in the United States spend with mobile screens might raise some eyebrows, as a new report found it has tripled in just four years."There are strong data that relate childhood TV time to obesity in children," said Hill, adding that it appears to be related to advertising of unhealthy foods and the likelihood that a child will snack while watching television.
"There are real concerns that screens influence eating behaviors, possibly because children 'tune out' and don't notice when they are full when eating in front of a screen," Tracie Barnett, a researcher at the INRS-Institut Armand Frappier and Sainte-Justine University Hospital Research Center in Montreal, said in a statement.
"There is also evidence that screens are disrupting sleep quality, which can also increase the risk of obesity," said Barnett, who led the American Heart Association writing group.
"Ideally, screen-based devices should not be in bedrooms," Barnett added, "because some studies have found that having screen-based devices in the bedroom can affect sleep."
So far, Hill added, research doesn't show a connection between obesity and social media or gaming, perhaps because it is harder to snack while gaming. But research is having a tough time keeping up with technological advances, said Hill, and long-term research is needed.
- Identify free times for activity during the week. Learn how to find time to get the whole family heart healthy.
- Make a plan to add physical activity to your daily routine. Be prepared to offer alternative age-appropriate activities to TV or video games after school. Make physical activity a regular part of your family's schedule. Write it on a weekly calendar for the whole family.
- Be active with your kids. Experts say that what kids want more than anything else is time with their parents. To give them that, don’t just send them out to play — go play with them! Develop a set of activities for you and your family that are always available regardless of weather.
- Limit TV, computer, video game time. Don’t position your furniture so the TV is the main focus of the room. Remove televisions from bedrooms. And remember to avoid using TV as a reward or punishment.
- Plan TV watching in advance. Go through the TV guide and pick the shows you want to watch. Turn the TV on for those shows and turn it off afterwards. Don’t just watch whatever comes on next.
- Practice what you preach. Your kids won’t accept being restricted to two hours of TV watching if you can veg out for four hours. The best way to influence your kids’ behavior is through example.
All of these might sound easy enough; they just take a little thought and a lot of practice. Do what you can as often as you can.
Information from: American Heart Association
The American Heart Association expert panel agreed, adding that little is known about the effects of long-term screen use on children's health. Parents also need research-based advice, said the panel, on how to break the siren call of screens and improve childhood physical activity.
Current ideas to help parents include getting the whole family active, scheduling a physical activity each day, removing TV and mobile screen devices from the bedroom, and planning TV viewing in advance.
The American Academy of Pediatrics has an interactive tool to create a personalized media use plan for the family. And remember, not all technology is bad, experts said.
"There are ways to leverage technology to improve health," said Hill. "My youngest got his first fitness tracker at 11, and comes to me every day to tell me how many steps he's taken."
