[zug_zug]

Sounds like those people are having an irrational emotional response to a term rather than addressing the presented research in good faith.

Also being a broad or nebulous category doesn’t make it not science… much of what science studies starts broad and nebulous or even theoretical.

[UncleMeat]

Right but we aren't at the "hey we found this category has some interesting correlations with health outcomes, let's look into this" stage. The authors are advocating for specific policy interventions using the definition of UPF.