"Jews" Begins with "J" But So Does "Japanese"

Bagels are considered a "Jewish" food.

Bagelheads, though, are people who inject saline into their foreheads to create bagel-shaped lumps.

But does this linguistic note have anything to do with Jews?

So far, no no

Bizarremag reported recently on an extreme body-modification fad sweeping
the Japanese club scene, wherein people inject their foreheads with saline
solution – causing bagel-shaped swellings:

They look like alien abductees, fresh from invasive research by their
interplanetary masters. But these are Japanese club kids, otherwise known as
bagelheads, deliberately disfiguring themselves by experimenting with saline
inflations.

These self-inflicted saline swellings last approximately 24 hours, and
can be molded into shapes and colored with food dyes.

but...?