The healthiest of fats for people with arthritis or other inflammatory disorders are omega-3 fats. While other foods increase levels of inflammation in the body, omega-3s actually work to decrease inflammation by suppressing the production of enzymes that erode cartilage. A host of studies have demonstrated that omega-3 fish oils can reduce symptoms of rheumatoid arthritis. Study participants reported greater strength, less fatigue, reduced joint swelling and tenderness, less joint stiffness, and less overall pain. The best foods for omega-3 fatty acids are salmon (wild, fresh or canned), herring, mackerel (not king), sardines, anchovies, rainbow trout, Pacific oysters, flaxseeds (ground and oil), chia seeds, and walnuts.