Jefromi proposes in the commentary to:
I would tend to say that food history is a reasonable question as much as food science - they're essentially both a type of "why do we do what we do".
This similar anthropology or food history question was referenced in the comments (still open):
Initially, I would have thought these questions are off topic, because we closed this previous case where it has been treated as such, despite an answer already existing (from me) showing actual cultural trends with at least a fairly credible citation was closed for being not a real question:
Despite the fact that the OP phrased the question in a rude and aggressive manner, the core question as to why "sliced white bread" is popular in the US would meet Jefromi's guideline, I think--and it is an interesting anthropological question.
I think that all of these questions should either be on topic (and we should reopen the closed ones) OR they should all be off topic and closed.
To provide food for thought, here is a food history question I could ask... do we feel it is a good fit for this site?
Why are chopsticks the main eating utensil in many Asian cultures, but forks and knives serve the same purpose in many European cultures, and those descended from European cultures?
BTW, I am not insisting that they be off topic--I think many of them ARE interesting questions. But I think we should be consistent about it.