Self-raising flour is not harmful to human body when consumed in moderation. Self-raising flour is a flour-based food that is mixed with certain food additives and can be fluffed up naturally without going through yeast fermentation during the process of steaming buns, breads and buns. The vast majority of self-rising flour contains both acidic and alkaline additives. In the process of steaming, acid and alkali are mixed together to produce a large amount of carbon dioxide, thus achieving the purpose of making food fluffy. The acidic and alkaline additives added inside are edible additives, and will not cause harm to human body if consumed in moderation over a long period of time. Of course, we can also use natural yeast in the process of steaming food. Natural yeast is rich in protein and B vitamins, which is good for health.