Kids used to go outside and actually play a game of baseball, football, hockey. Now the game is watching someone else play–not much exercise in that. Girls probably get more exercise now than boys do.
Food is too easy for most people to get, and much of the time it’s the wrong kind of food.
I read an article the other day that said man was intended to spend most of his time each day walking. He had to if he wanted to find and gather enough to stay alive. Part of the time he had to run if he wanted to stay alive. There was little chance that he would get fat and out of shape.
Now there’s a McDonald’s on every street corner offering 1000 calorie Big Macs, half of what the cave man could find if he kept moving half the day.