CasioTheSane comments on How to use human history as a nutritional prior? - Less Wrong Discussion
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Good point, foods that have been historically clearly identified as toxic would have already moved into the non-food category. So this advice is effectively saying, "look only at your priors and don't consider or collect new data."
If our ancestors took this advice literally they'd have kept eating things that can obviously kill you, like digitalis.
In reality, I think the spirit of the advice is a warning not to under-estimate the importance of your priors: don't consider new data in isolation.
You have managed to extract a rather useful generalizable point from the subject!
As well as this we can assume that the advice also covers the idea of not putting all your eggs (be they epistemic or dietary) in one basket.