If teenagers in the 1950's spent allot of time at diners how come they weren't overweight?

I know that diners were very popular with teens back in the 50's and in the diners they ate burgers, fries, coke, ice cream, pies, milkshakes etc, but how come they weren't fat?If teenagers in the 1950's spent allot of time at diners how come they weren't overweight?
...they had to get out of the house to do things...


...no laptop...tv wasn't high tech like it is now...


...more dances to go too...


...life was active, then...If teenagers in the 1950's spent allot of time at diners how come they weren't overweight?
A few reasons; the serving size of food was smaller; there wasn't as much chemicals in the food that made it addicting and unhealthy; and teenagers didn't eat in diners as often as you think they did, it was a weekly or monthly thing.





On top of that the teenagers in those times played sports to pass the time. TV was a family thing and was only watched when the entire family was there.
They probably didn't eat as much in quantity. They also didn't have huge leather couches with a plasma in front to let all the fat settle into their sides. Nor did they have video game consoles, or many other technological advances than many Americans spend too much of their time on.





Back then, they walked, biked and enjoyed outdoor activity. That is slowly starting to fade away in this day in age..
Because they certainly didn't have as much technology as we do in this day and age. We could sit in front of the TV all day playing playstation or on the internet, but they didn't have them back then so they would have had to find other things to do. These included social activities such as bowling and rollerskating. And remember their was a lot of dancing going on at diners in the 50's. You don't see that going on at restaurants now days...
Did you also notice what they did after leaving the diners?....Most of them went dancing, and to the beach where they worked off all of those calories....There were many activities that kids back then got into and not only that, they created their own fun and did not sit around playing video games, spending lots of time on the computers and watching TVS. The kids of today are totally different from the kidss 50 years ago.....Times were different in those days.......
One reason they didn't gain too much weight back then was because they kept active with things like dancing, roller skating and bowling... they didn't sit home in front of tv as much and didn't have video games or computers.