A diet rich in omega-3 fatty acids, fresh fruits and vegetables and low in sugar, excess fats and diary helps combat psoriatic arthritis, according to the National Psoriasis Foundation. Fish, nuts and seeds high in omega-3, including salmon, tuna, walnuts and flaxseed, work to reduce inflammation in the body.
Consuming leaner cuts of meat without skin improves overall heart health, which is also linked to psoriasis arthritis, according to the National Psoriasis Foundation. Olive oil is a healthier alternative to partially hydrogenated oils, while baking and broiling are recommended over frying. Allergies and sensitivities to foods such as gluten also trigger inflammation in some psoriatic arthritis sufferers.