I have had rheumatoid arthritis for 13 years. Been on every medicine that has been created for it, including some very expensive and controversial biologics. (Embrel, Humira) Last August I cut out all grains and processed sugar. My joints improved immediately. The next step was to cut out high oxalate foods.
My personal belief is that our food stuffs have been adulterated (modified) to the point that they are no longer recognizable to our bodies as food/nutrition.
My RA is currently in "remission". I have lost 40 lbs and am able to do more now, at the age of 51 than I was able to do in my 30's when my health started to deteriorate. (Fibromyalgia, Chronic Fatigue and allergies to everything)
I do believe that all disease starts in the gut.