When the coating of a rice cooker falls off or is damaged, the food may come into direct contact with the metal material at the bottom of the cooker, which may cause certain ingredients in the food to react with the metal and produce harmful substances. In addition, peeling coatings may cause the rice cooker to become less non-stick, making it easier for food to stick to the pan and increasing the risk of scorching and producing harmful substances.

The coating on rice cookers is usually made of materials such as polytetrafluoroethylene, which is heat-resistant, non-stick and rust-resistant. When the coating is intact, it prevents food from coming into direct contact with the bottom of the cooker, which reduces the risk of food sticking and burning.