I've found that a grass-grain-free diet totally controls my joint pain. That's no wheat, rice, corn, barley, rye, triticale....
I breakfast daily on sunflower, sesame and pumpkin seeds and lsa mix. Quinoa and buckwheat seem to be ok, and but my preference is to get my carbs from vegetables.
I'm blood group O. That means I carry serum anti-A and anti-B antibodies. These antibodies are raised not in response to exposure to other people's A and B antigens, but to plant lectins. I'm old enough to have been given cow milk formula supplements from birth (thus diluting the effect of colostrum and exposing my immature gut to plant lectins in the cow milk formula). I wonder if that is the process that triggered my sensitivity to grass grains, probably exacerbated by exposure to herbicides and pesticides, which are known to interfere with immune system.