There actually is a stopping point , and the definition of ultra processed food versus processed food is often drawn at the line where you can expect someone in their home kitchen to be able to do the processing. So, the question kind of goes whether or not you would expect someone to be able to make cheese or wine at home. I think there you would find it natural to conclude that there's a difference between a Cheeto, which can only be created in a factory with a secret extrusion process, versus cottage cheese, which can be created inside of a cottage. And you would probably also note that there is a difference between American cheese which requires a process that results in a Nile Red upload, and cheddar cheese which still could be done at home, over the course of months like how people make soap at home. You can tell that wine can be made at home because people make it in jails. I have found that a lot of people on Hackernews have a tendency to flatten distinctions into a binary, and then attack the binary as if distinctions don't matter. This is another such example.