[ Paradox - I always find it funny that several countries I have visited - US, Canada, UK and Australia - all scream “We have the fattest kids in the world” - I wonder what the truth is]

Let me just say this about that:

Not a scientific survey, small sample, subject to confirmation bias, ymmv, and tax and license not included, but I’ve traveled from the States to London on two occasions, a year apart. It’s also true that there’s a lot of walking going on in the city that might not be going on out in the country, and we only ventured outside of London for a day trip once on each occasion. (Stonehenge, Bath, and Windsor tour each time, lovely, highly recommended but spend the night in Bath if you can.)

But.

We noticed very few people there with what I would consider major weight problems, and without exception, the ones who did had American accents.

Ditto rude people, as an aside, the one having no correlation to the other.

Just sayin’.

Well that just raises the question of why THOSE things are disks and not spheres. Cusp has the correct answer above.

No and a little (in the inital stages of formation)