Patients with rheumatoid arthritis should adhere to a light diet and avoid spicy foods, overly nourishing and greasy foods. Specifically, the following foods should be avoided: vegetables such as celery, coriander, shiitake mushrooms, leeks, and seaweed. In terms of meat, one should reduce consumption of warming foods like lamb, beef, and dog meat. Also, it is advisable to limit intake of high-protein seafood such as shrimp, crab, and sea cucumber. Regarding fish, preference should be given to freshwater fish, while the consumption of sea fish should be minimized. These are the foods that should be avoided by those suffering from rheumatoid arthritis.