I'll bite:
Look at the map of searches for 'college football' here - http://thequad.blogs.nytimes.com/2011/09/19/the-geography-of...
Now look at obesity rates at the county level here - http://www.maxmasnick.com/2011/11/15/obesity_by_county/
http://filipspagnoli.files.wordpress.com/2009/12/percent-of-...
I have a hard time believing that obesity is causally related to "college football" or televised sports in general. Except perhaps the fact that it's a sedentary activity, but a sizable chunk of HN probably spends far more time working in front of a computer.
Correlation is not causation, but it is correlation...i.e. things which will affect college football viewing might affect obesity as well. Ergo, if college football becomes too expensive to watch, maybe obesity rates will reduce. This is my hypothesis; only an actual experiment can show if this is true or not.