Yes, I do also think it is the form - the molecular form - that counts. I think Klebsiella might play a role in the gut, but I think proteins leaking into the blood stream might be even more important. Or some kind of food intolerance like this study suggests http://www.arthritistoday.org/conditions/rheumatoid-arthritis/nutrition-and-ra/ra-food-allergies.php Here they recommend the paleo / stone age diet, which excludes "new foods" such as grains, milk etc.