>What food has the term "UPF" helped you learn is 'unhealthy', which you otherwise would have thought of as healthy?

It's not that I didn't know that certain foods were unhealthy. The term UPF (understood to mean foods that are manufactured specifically to be hyper-palatable while otherwise lacking in nutrients) taught me the reasons why I find certain foods harder to resist than others, and consequently what foods I should focus on instead (higher protein / high fiber).