I read the book initially almost 3 years ago and while I thought her advice made sense I also thought I have OA (diagnosed with FAI and OA in both hips) not RA so how will changing my diet be of any help.
Well 12 months ago I was in so much discomfort every day that I was willing to commit to the elimination diet and fast she suggests. My thinking was, it can't hurt me, it won't cost me anything, and I need to learn if this will help or not.
In one week of following the elimination diet, I was able to reduce my pain significantly (I now live mostly pain free) and increase my range of motion. I can tie both shoes comfortably which I couldn't do before.
As a side benefit I also comfortably lost 25 - 30 lbs in several weeks, which I attribute to lower inflamation and thus carrying less imflamatory fluid around as weight.
Post elimination diet, I had my Nathuropath (ND) help me determine which foods I was sensitive to. She had me take and Elisa IGG blood test via the folks at foodallergy.com. It was expensive but seemingly fairly accurate for me. If I follow the list of "non-inflamatory" foods I don't generally suffer from OA pain.
Not sure if this will work for you but it helped me a lot.