Ginger and potatoes are poisonous. Ginger is bitter because your body recognizes the toxins in it, but our livers are adapted well enough to them that they can filter them out and turn them into something less hazardous. Raw potatoes contain neurotoxins in their flesh. It’s not enough to cause us trouble unless eaten in excess and it denatures when you cook them, but they’re there.
Basically, the toxins in potatoes and ginger aren’t in high enough concentrations to hurt us, but they’re more than enough to cause trouble for a little worm trying to get a meal underground. So they avoid them.
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