There are a number of people who believe endometriosis an auto-immune disease that can be greatly addressed with a change of diet. Several women who "went paleo" claim that the symptoms linked to their endometriosis got better, though the medical community doesn't consider these claims "definitive." Basically, research into what causes endometriosis, and how to treat it best is relatively new. However, there is a growing body of evidence that links gluten and lack of exercise to worse endometrial symptoms.
In Robb Wolf's podcast (episode 66), he briefly addresses endometriosis and says that it's linked to insulin irregularity, but doesn't cite any references. Does anyone have further information on this, and how a paleo lifestyle may address endometriosis? It sounds perfectly reasonable that endometriosis is indeed an auto-immune disease brought on by a post-agricultural (and mostly modern/western) diet, and I'd love to see more supporting evidence of this.