I notice more obesity in Poland - in fact among children it's now at crisis level.
There's certainly much more obesity than when I arrived fifteen years ago, but I don't think it's quite as bad as you say among children. Having said that, it will be a serious issue within twenty years. It doesn't help that doctors are too willing to give kids a note excusing them from games. When I was a kid even 'the fat kid' (there was always and only one) had to do the hated cross country running, whose name we appropriately abbreviated. In my faculty's first year intake last year there wasn't a single student who could have been described as obese, and only one girl who was a little on the porky side. This will, I fear, not last long.