That's the hypothesis being proposed by a recent study: the idea is that if you play videogames then you're too busy to chuck chips down your gullet.
This is in contrast to the less involving pastime of idly watching telly, an activity that leaves your hands free to gorge yourself on snacks. The study comes from University of Michigan and its study of US sixth graders.
NPR has unearthed the study and states:
"Our hypothesis is that when kids are watching TV, they're going to be accessing commercials that are more likely to be food related," says Dr. Elizabeth Jackson, an associate professor of medicine at the University of Michigan Health System, who led the study.
"Jackson and her colleagues checked the health of 1,003 middle-schoolers and asked them about their snacking habits. The research was presented at the American College of Cardiology's Scientific Session in Washington, D.C.
Though the big consumers of TV, computer time and games all said they ate more junk food than the low-screen-time kids, the TV-watchers were most adept at eating chips and french fries."