Not everywhere, but it certainly seems like that's happened in the US. Most people I know (from here in the UK) who have been on trips to the US have come back

Not everywhere, but it certainly seems like that's happened in the US. Most people I know (from here in the UK) who have been on trips to the US have come back shocked at both the portion sizes and the lack of opportunities for exercise in everyday activities (apparently this is a lot to do with a culture of driving everywhere). And if it was a longer trip (weeks/months), they've often also put on a noticeable amount of weight that they then quickly lose once they're back home.