I think the problem has multiple causes.....
First off, we eat too much. Our proportions are just freaking huge. When I go to my favorite Italian restaurant the food on my plate is twice what I should eat in one sitting.
Second, we are spending less time "doing stuff" and more time watching TV and on computers. It's not that we are lazy; If we had non stop on demand TV entertainment in the 1980s I would have never stepped outside.
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