Firstly, systemic lupus erythematosus is a chronic autoimmune disease that can affect multiple systems, including the skin, heart, kidneys, lungs, and nervous system, among other organs. The skin, kidneys, and lungs are the most commonly affected organs. If the kidneys are affected and proteinuria occurs, it is necessary to restrict salt intake. The general principle is to have a low-salt, low-fat diet, and to limit the intake of high-quality proteins, which mainly refers to lean meats and pure milk. It is necessary to drink more water, avoid sun exposure, avoid oral contraceptives, and in terms of diet, fruits such as figs and mangoes that have been exposed to sunlight for a long time are prohibited, including tomatoes, while other fruits can be consumed in moderation.