Firstly, systemic lupus erythematosus is an autoimmune disease that can affect multiple systems and organs and cannot be cured. It can only be managed through medications to control the progression of the disease and delay the onset of complications. Therefore, it's not about what food is good for lupus, but rather about managing any complications it may have. Some foods to avoid include tomatoes, bayberries, figs, celery, bananas, as well as other fruits and vegetables that have been exposed to prolonged sunlight. The general principle is to adopt a low-salt, low-fat diet while increasing the intake of high-quality proteins, primarily lean meats and pure milk, to boost resistance and immunity.