[pjc50]

This is one of those things that varies by cultural cachet rather than actual quality. It's not that different from people living off Japanese konbini, but those are perceived as much cooler.

Most cities will have local sandwich options as well near major office districts, but they might not be as cheap.

[Thraway198]

No, Konbini, and Japanese food in general, is much much healthier than the equivalents in the West. Especially the Anglo West.

[Symbiote]

Konbini have more unhealthy stuff than you'll find in the ready-to-eat section of Tesco, although the sushi is better in Japan.

Both are way ahead of the USA.