There was a time in this country where the closest store was miles away and only 15-25% of the population owned a car. People walked everywhere! You can't blame television for the country's weight problem. TV isn't that important, nor is it that special.
I will agree with you about TV and intelligence though. But that depends on what you're watching. If you spend all day watching MTV or BET, I can bet your IQ is goin' WAAY down. I blame pop-music culture. But if you spent all day watchin' Discovery or National Geographic, I'm sure your IQ will remain in tact. Though, I don't think it's gonna make you THAT much smarter.