A new study of studies shows a link between media use and bad health in children.
The study looked at 28 years of research on how the different forms of media affect children's lives, including television and movies, to music and the Internet.
There have been about 173 research studies going back to 1980. Of those, about 80 percent show bad health is directly linked to the hours spent viewing media.
The research also shows an average American child spends nearly 45 hours a week with cell phones, TV, the Internet and other forms of media.
Compared to the 17 hours a week children spend with their parents and the 30 hours a week children spend in school.
The study also shows that kids who spend lots of time viewing media are more likely to smoke, be obese, use drugs and alcohol, be sexually active earlier, have attention deficit disorder with hyper activity and perform worse in school.