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A new study has revealed that spending a lot of time watching TV, playing video games and surfing the Web makes children more health problems.

The report found strong connections between media exposure and problems of childhood obesity and tobacco use. Nearly as strong was the link to early sexual behavior.

The studies, most conducted in the United States, largely focused on television, but some looked at video games, films, music, and computer and Internet use. Three quarters of them found that increased media viewing was associated with negative health outcomes.

The average modern child spends nearly 45 hours a week with television, movies, magazines, music, the Internet, cellphones and video games, the study reported. By comparison, children spend 17 hours a week with their parents on average and 30 hours a week in school, the study said.

Keeping an eye on children’s media use is tougher today, says Jane Brown, a journalism and mass communication professor at the University of North Carolina-Chapel Hill who was not involved in the report. In the past, families often watched TV together, and parents could easily change the channel or voice their disapproval. Today’s technology often isolates children, who may tune out their families to concentrate on a cellphone screen only they can see.

The report’s authors hope it will be taken to heart by parents, as well as educators, pediatricians and policymakers. They came up with suggestions for each group, and James P. Steyer, chief executive of Common Sense Media, suggested that parents get involved in what their children see, hear and play — and for how long.