Always with the vitamin d plugs, kat! Can't blame you, it's totally essential for nearly every aspect of health. And I'm just as bad with omega 6. Which reminds me.
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
So we see here that fish oil definitely improves arthritis, but the interesting thing is that arachidonic acid restriction (and obviously linoleic acid because it converts to arachidonic acid readily) improves it independently. This indicates that overall tissue concentration of n-3 to n-6 is hugely important for arthritis, and any inflammatory disease for that matter. Which reminds me that I eat like an overweight, arthritis-ridden, diabetic cancer patient should 
Primal will help hugely. Here's plant lectins and toxins courtesy of Dr. Cordain. http://www.thepaleodiet.com/articles...itis%20PDF.pdf
All nutrients should ideally be capped off and in good ratios where applicable. I would dare to say that anyone who start following Mark's eating recommendations will have a drastic reduction in arthritis pains.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!