Some paleo diets and blogs claim that people should avoid plants from the nightshade family (tomatoes, eggplants etc). Some inflammation and auto immune blogs claim the same thing. Does anyone know if these claims have a scientific basis and, if so, what mechanism is purportedly driving the effect?

I figure there has been enough interest on paleo here, that before I invest hours into digging through Google scholar it makes more sense to ask if anyone already knows the answer. Thanks in advance