In North America at least, people drive everywhere..even when they don't need to. There's far too much TV, computer using, and playing of video games. Not nearly enough exercise..and youth and adults making bad food (high fat, high-salt plus processed and/or sugar loaded) food choices.
High fructose corn syrup being found in so many food products is not helping matters, but personally I don't think it's as big of a problem is it has been made out to be. It should be curtailed from so many products but for that matter ...so should sugar in everything and use of transfats.