Expired baking powder may be harmful to the body when eaten. Food generally have a shelf life, baking powder is the same, baking powder storage with the extension of time there will be some changes, such as deterioration, etc., this change gradually increased to a certain extent may cause harm to the body, the shelf life of the baking powder this change is generally not enough to lead to harm to the human body, so you can consume normally. Expired baking powder may be spoiled and other phenomena, because the baking powder in addition to acidic powder and alkaline powder, in order to avoid them in contact with water when mixing prematurely, overreaction, into the edible filler such as cornstarch, etc., cornstarch long time may be moldy, etc., people may eat it may cause harm to the body. Even in the shelf life of the food, before consumption, should also observe the food color, aroma, taste, etc. There is no change, if there is a change should also be abandoned to eat.