The kids were always physically active; playing baseball, cowboys and Indians, and etc. They would play until dinnertime and after dinner would play until it got dark. The moms would be out hollering for their kids to come home. It was time to come in and get ready for bed.
Now everyone distrusts their neighbor and the kids have nowhere to play or are afraid they will be taken by some pervert. No longer do they play until dinner time or go out again to play until bed time. Instead, they have the security behind their locked doors for mental amusements.
Some of the obesity is the natural product of an aging society. With the Baby Boom generation moving into the upper ages, there is a larger number from this demographic sector contributing to the obesity numbers.
In all fairness there has been perverts picking up kids.. What happened was John Walsh made a movie about his kid and then all of the sudden kids can be no longer kids..