Well, if I didn't have the credentials to make folks believe, it appears that Dr. Cordain is wading into the nightshade waters, with the tomato lectin as a jumpoff point (I haven't addressed that mechanism...yet):
Of Tomatoes, Vaccines and Autoimmune Disease – Tomatoes are almost universally considered to be healthy foods, though there are anecdotal reports that avoiding consumption of nightshade plants, including tomatoes, may improve symptoms in patients with rheumatoid arthritis and other autoimmune diseases.
In this cutting-edge report you’ll learn about a component, tomato lectin, which has the capacity to interact with the immune system in a way that may promote autoimmune disease. You’ll also learn about another component of tomato, alpha tomatine, which can act as an adjuvant and boost the immune response to tomato lectin, and also increase gut permeability.
I know he'll likely be pointing out with the tomato lectin is that they are hardy enough survivors through the human system that drug companies are studying using them to help deliver vaccines...nasty stuff.