[worik]

> At what point in the process does it stop being food?

    Just because you cannot see a clearly defined boundary does not mean it is not there.  A corn cob is food, a processed piece of corn mixed with <insert flavoursome/colourful/preserving chemical> sealed in a plastic bag with a six month shelf life is not

[saghm]

What you're saying sounds reasonable, but it completely avoids the question I asked about what point in the process it stopped being food by only mentioning the first and last steps. I'd argue that in order for a boundary to be clear, there needs to be specific step in the discrete process where the output of that step isn't considered food anymore. I honestly can't tell if you're saying that I personally can't see the boundary but you are able to, or if you're using "you" generically when you say "you cannot see", but if you mean the former, I don't think it's particularly helpful to assert that you know what it is without explaining further, and if you mean the latter, I don't think I agree with you on what constitutes a boundary being "clear".