Patients with rheumatoid arthritis should avoid the following three categories of food: The first category includes foods that can easily trigger photosensitivity, such as celery, coriander, shiitake mushrooms, seaweed, and leeks; these should be avoided. The second category includes overly warming and tonifying foods, such as dog meat, lamb, and longan; it is best to consume these sparingly. The third category includes high-protein seafood, such as shrimp and crab; these should be consumed in limited quantities because they may exacerbate rheumatoid arthritis symptoms and potentially trigger allergic reactions.