It can be quite eye-opening to travel from say, the UK to Hungary. Walk down a busy street in London and you'll see many overweight people. Walk down a similar street in Budapest, and you'll see very few.
The numbers don't seem to bear out your impression, Hungary has higher rates overall than the UK. Perhaps there is more social mixing in the neighborhoods you visit in London vs Budapest.
Which countries? As far as I know, most Western countries have roughly similar issues with obesity, at least directionally.