I think you’re getting to where I personally think the problem is. I’m assuming when you were a kid, there were a McDonald’s in every town/city just like they are now, as well as soda’s and junk food. Some of us were lucky enough to have a mother at home that didn’t let us eat that crap or more or much less bring it home to eat from work
Your generation also enjoy going outside riding bicycles things like obesity and children probably wasn’t even an issue. I’m a millennial and obese and children was still rare. Now it’s a thing.