I go so far back that we wrapped 4 sandwiches by cutting up the double layer waxed paper that bread came in. Waxed paper from a roll was a luxury. Kids back then ate more wholesome food and walked most places. No one I knew was obese. It's harder now with all the processed food and cars.
Ya know, I only know of one over weight child in our Catholic class room of 60 students - half fifth grade and half sixth grade. The Nun kept control of us all. She had a talk to us about being kind to ‘Tommy’who was fat. Tommy had many friends the next day. There was no bullying. If the Nun saw it, she nipped it in the bud.