Worth noting that in the absence of refrigeration, you don't get to choose whether to ferment your food, only how it ferments. That's a set of practices that far predates the use of cassava (a South American plant), and possibly predates H. sap.
Replying to @St_Rev @Scholars_Stage
The framing here seems confused. Westerners ask why South American farmers ferment their cassava, notice one particular non-obvious effect, and puzzle at the connection. But there's a much easier answer to the fermentation question: Not fermenting isn't actually an option.
11:15 PM - 9 Jan 2019
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.