From what I was reading, it sounds like the levels are fairly low, anyway, kind of like arsenic or other poisons/toxins that occur naturally. However, if there's a way to grow it out of it, then even better. :)

I've heard only good things about cassava, so I doubt people are dropping like flies from eating them.

Otherwise it would be Cassava and Old Lace. :) *I gave him cassava juice, and I didn't even have to poison it with arsenic!"