What was the point of Fat Head?

With all the reminiscing over childhood days I was reminded of a scene in Fat Head where Tom Naughton shows cars lined up to drop kids off at school.  He contrasts this to how he used to walk to and from school often twice a day as he went home for lunch.  That scene could have been shot in my neighborhood these days, and is a far cry from my childhood.  I walked to school most days -- I'd like to exaggerate and say uphill both ways, but it was only uphill one way -- 3 hills to be exact.  In milder weather I rode my bike.  And, like Tom, after school spent several hours most days playing all manner of running games.  It definitely seemed that Tom was making a case for less activity contributing to the obesity epidemic.  If not, what am I missing?

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