The reason?
Back then if you wanted to do something you went outside, rode a bike, played sports, etc. and there weren't fast food joints on every street corner. Today no one hardly leaves the house, they are addicted to their video games, the internet, and reality TV. Their addictions are so overpowering they want fast food instead of wasting valuable time cooking good food.
The downside of technology... It makes people lazy.
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"The towers are gone now, reduced to bloody rubble, along with all hopes for Peace in Our Time, in the United States or any other country. Make no mistake about it: We are At War now -- with somebody -- and we will stay At War with that mysterious Enemy for the rest of our lives." H.S.T. 09/12/01