What's ultra-processed vs processed? If I make my own sausage by grinding the meat by hand, mixing it with salt and spices, then filling natural casings, I would consider that processed food. What makes it ultra-processed? When Hormel does it instead?
One rule that's easy to verify is: would you have all the ingredients at home? UPFs usually have ingredients you've never seen for sale.
Like that definition doesn't seem to work when there's foods where the commercial variant is made differently to the normal version.