Hum, let me explain a bit. I understood that it's a new fruit in the region, and seems that even the local population wasn't considering relations between the fruit and the illness. And, exactly because of that, it made me think about how things were in the past.

In other words, given enough time without attention and information and so on, would a new belief arise in that population, one strong enough that would prevent kids from eating the fruit? And few of those who eat them anyway would perish, reinforcing the "tradition" that it was a cursed fruit (or something like that) ?

Of course, if you consider that the same constraints that were present 3,000 years ago still persists: lack of a good knowledge about chemicals and biology and how the human body behaves.