I believe modern life is an issue for both. Stress, processed foods, and resting because you are sick do you no good. A good writer to read is Terry Wahl's: she has a diet and also very insightful writings about autoimmune. Dr Wahl made large changes to her life and got out of a wheelchair and back to good functioning. You might not go "all the way," but her ideas have had the benefit of robust testing and have helped many.