Stir-fried rice, also known as oil-fried rice, is rice stir-fried in the small amount of remaining oil in a wok immediately after cooking a dish. While this makes full use of the leftover oil, this type of rice is harmful to health. This is because after stir-frying, the remaining substances in the wok not only include oil but also MSG, salt, soy sauce, and other seasonings. These substances can become charred due to the heat of the wok, easily forming carcinogenic substances. Therefore, it is not advisable to use the leftover oil in the wok to fry rice.