A huge difference nowadays is the easy access to the internet, YouTube, Facebook, video games and electronic gadgets, which most kids are hooked on.
I imagine the parents have an easier job as the kid is occupied and no work is needed to be done.
I grew up early 90's, all I had in the house...
Compulsory Diet and Nutrition education.
More PE at school.
More exercise out of school.
Proper diet with less carbs and much less sugar.
A daily kids meal shouldn't be: Toast with jam, sandwich, crisps and chocolate, pasta and sugar filled dessert.