I grew up in the UK. We have approx 30% obesity rates so less than the US but still pretty crazy.

Single parent who worked (and still does work) low paid manual labour style jobs. Same with the estranged parent who was around for a while.

I dunno. People talk about being a surroundings thing. But then the way it has worked for me and my siblings is that for the most part we've looked at the ways in which our own parents failed and tried to improve on that.

For what it's worth we ate a lot of "crap" food growing up but just portion controlled it reasonably I guess?