4. Gluten. The trend against gluten consumption is real for some arthritis patients. Though studies have yet to prove it definitvely, there are many reports of associations between celiac disease and rheumatoid arthritis, according to Rheumatology News. A study published in the Oxford Journal of Rheumatology reported 41 percent of rheumatoid arthritis patients tested on a vegan, gluten-free diet showed improvement.
5. Trans-fats. Foods containing trans fats should be avoided since they can increase inflammation, according to The Arthritis Foundation. Trans fats can be found in processed snacks, fast food, and many stick margarines, as well as cookies, donuts, and crackers, the website said, noting to check ingredient labels for partially hydrogenated vegetable oils.