2. Spinach
We know spinach is not for everybody. But it should be! That distinct flavor is actually indicative of the fact that spinach, like other dark leafy greens, is simply packed with nutrition. The good thing about that is you can get what you need without eating a ton of it. But we digress.
Spinach is particularly high in the antioxidant kaempferol, which is known to decrease the discomfort caused by the inflammatory agents associated with rheumatoid arthritis. It may even be able to slow or prevent the progression of osteoarthritis.
More research is needed, but since spinach also increases the production of red blood cells, reduces the risk of cancer, prevents free radical damage, detoxifies heavy metals, and helps fight infection, you should be eating it anyway.