If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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1. Please add the 'open_thread' tag.
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Yes, I considered that approach. But the vagueness involved in the notion of a "piece of junk food" was such that I found I had considerable latitude in determining how many pieces of junk food I ate on a particular day. By contrast, deciding whether I ate a certain type of junk food at all is usually quite straightforward, and not subject to rationalization. As Jon Elster wrote:
(Of course, you may not have a problem if you are sufficiently self-disciplined, as you seem to be.)
Yeah, that seems right.
I tend to define it roughly as "250 calories of something that is devoid of nutritional value and consumed primarily for taste".