Same thing in many US cities where walking is the norm.

The other major factor is wealth. Richer people can afford higher quality food. Poor people generally consume more calories from junk foods and sugary drinks, which are staples of drive-throughs and fast food chains.

Not sure that the UK is that car reliant. I guess in rural areas, but that's true in most countries. In cities, not at all.

62% of all trips in the UK are made by car, compared to 26% by foot, 6% by bus, 3% by train, 2% by bicycle. https://assets.publishing.service.gov.uk/government/uploads/...

It is not as entirely car dominated as the USA, but I think it's pretty fair to call it "car reliant".

It very much depends on the city. London has excellent public transport (and is horrible for driving), other cities are much more mixed.