The role of yeast can be mainly categorized into edible (e.g. making buns, bread, etc.) and medicinal (e.g. eating mother’s raw tablets, etc.). 1. For food, common yeasts that can be added to food are brewer’s yeast and tea yeast, which can be used for brewing wine and tea yeast for tea fermentation. Baker’s yeast isolated from brewer’s yeast can be used to ferment a variety of pasta and play the role of fluffing. 2. Medicinal use, common yeast used for medicinal purposes are dry yeast. For example, the dried yeast is used as the main raw material for the production of tablets, which can be used for the auxiliary treatment of dyspepsia and the prevention and treatment of B-vitamin deficiencies. A common adverse reaction to this medication is that an overdose may cause diarrhea. It is important to note that when yeast is used for medicinal purposes, it needs to be used under the supervision of a medical professional. If you are allergic to yeast, it should be contraindicated both in food and medicine.