Plants like the animals we eat have never been our "friends". They don't want to be eaten just like you or I. Animals just find ways of adapting and tolerating them. I don't find this article shocking at all. It's more like...duh.
Also ALL nightshades contain solanine in them.This includes tomatoes, potatoes, chili peppers, and tobacco. They are all related to one another. In sensitive people the solanine causes joint pain/stiffness. It takes about 3 months to completely clear solanine out of your system by avoidance.