No, baking soda is needed for steamed bread fermentation. The principle is that baking soda reacts chemically to produce gas, which makes noodles soft. Yogurt does not contain baking soda, and expired yogurt will produce many harmful bacteria, which is not good for your health.

Yeast powder is a compound additive, which is mainly used in the production of flour products and puffed food. There are many substances in baking powder, and the main components are sodium bicarbonate and tartaric acid. Usually a compound of carbonate and solid acid. When carbonate comes into contact with water and acid, it breaks down into several substances. In this process, carbon dioxide is released, but no flavor substances are produced. Therefore, the taste of the product will not be affected.