Try avoiding nightshades -- it helps a certain percentage of people with RA. And there are many anti-inflammatory substances out there, such as boswellia and devil's claw which have been shown to be particularly helpful for RA. This is a complicated question, however. One of the best things to do is avoid that which is pro-inflammatory, such as white flours, wheat, sugar, and bad fats. It wouldn't hurt to see a holistic nutritionist or naturopath if you want to try a natural approach.
Fight Inflammation
Phytonutrients in broccoli, like sulphoraphane, are known to fight inflammation of the joints, One study found sulphoraphane may help prevent the activation of an inflammatory enzyme known as COX-2, similar to how anti-inflammatory arthritis drugs work.
Olive Oil contains a natural anti-inflammatory agent researchers have named oleocanthal.
Blueberries ( suggest Wild Blueberries you can buy them frozen they have more nutrients! than farm grown)
Fish important source of omega-3 fats, the anti-inflammatory healthy fats
Nuts contain L-arginine and magnesium, an important role in modulating inflammation.
Tart Cherries or Tart Cherry Juice, contain anthocyanins a powerful anti-inflammatory.
Fermented Foods Kefir, sauerkraut, kimchi and other fermented foods are rich in friendly bacteria known as probiotics help curb systemic inflammation
Papaya contains the enzymes papain and chymopapain, which help lower inflammation.
Green Tea contain anti-inflammatory compounds called flavonoids
CoQ10 is also a good supplement to take.
Talk to your doctor first!
check with your doctor to see what the normal range is for the lab that tested your blood.
http://www.healio.com/rheumatology/rheumatoid-arthritis/news/online/%7B34afee61-1456-4415-8ccf-db7f95b752e8%7D/elevated-rheumatoid-factor-levels-increased-long-term-risk-for-ra