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Does this study factor in the huge life style changes over 20 years? Far more access to cars, and far more spending entire days sitting down (computer jobs, Netflix binge watching, etc). A lot of how we live has changed in 20 years, I'm inclined to think the problem lies there, not in environmental factors.

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We had cars and tv/video games/films 20 years ago. I know, I was there.

I'm aware of that. You didn't however have such a reliance on cars, nor the convenience afforded to having a car (e.g., the popularity of drive-thrus now, which were only getting started in 1980). There is such easy access to things like Netflix and Steam - it is very easy these days to waste entire days away without even noticing.

1980 was thirty-five years ago, not twenty.

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