How do we define what food is ultra processed though? Do we need "cake (commercial)" and "cake (home baked)" as I can bake a cake with all the standard stuff I have at home, but commercial cakes are usually chock full of E numbers. Another example would be like a jar of pasta sauce and a pasta sauce I've made, I don't think it's arguable that a pasta sauce I've made is ultra processed.

Like that definition doesn't seem to work when there's foods where the commercial variant is made differently to the normal version.