Totally OT here...
I am not sure that regular stroller use for older kids has anything to do with obesity. however i dont really see that many older kids in strollers where i am either. if you banned strollers for anyone 4 and above i doubt it would have an impact on obesity. imho obesity these days is nothing but food addiction and the only time we will see some impact on that social problem is when there is will be obesity rehab camp and the corporations dont get to decide what people should eat.
being the mom of an older kid though the stroller has taken on a whole different definition for me. stroller at the store means a peaceful shopping experience for me on those days dd does not want to go to the store - when she is tired and zapped and yet we dont have a choice.