Isn't this obvious to anyone who follows that diet autoimmune disease? Also adrenal hormones increase during fasting, as can be commonly seen with high cortisol levels in those who fast. "All disease begins in the gut," as someone wise has said in the past.
It's usually "obvious" to people who are not affected by autoimmune disease, but diet control is generally disappointingly ineffective in reality for most patients. The truth is autoimmune disease is incredibly complex and we still don't have satisfactory treatment, diet or otherwise.
It seems to me that diet has such an enormous effect on our bodies that it should do something; I would say compliance is more the issue than its effectiveness from my reading of things.