I've never heard a story like this from my country (Netherlands) but I suspect that's mostly due to different rules for care. Even if you want to be fat and 'disabled' you still have to get up and show your face at the local government office regularly and social workers will pester you constantly to come see them, so fusing to a chair isn't really an option. Also, it's a lot harder to get a scootypuff if you're just fat because they're expensive, so fatties are forced to move more. Still, I'm sure it's just a matter of time til we have our own stories.