It is no problem for pregnant women to eat yeast powder. Although yeast powder is also a food additive, it is harmless to human body. Yeast powder contains a lot of vitamin B and yeast. Yeast powder uses sucrose, glucose and amylase in flour to decompose some sugar in flour into carbon dioxide and alcohol, so that dough will become soft and fragrant. In the process of fermentation, substances harmful to human body will not be produced. So it is suitable for the general population. If you add some sugar to the dough, the dough will be softer and the steamed bread will be bigger. Fermented flour is more nutritious, easy to digest and more nutritious than unfermented food. Vitamin B deficiency is most suitable for eating. In the process of fermentation, the dosage of yeast should not be too large, but moderate.