First, the reason for nourishing the stomach: steamed bread contains yeast, which is divided into fresh yeast and dry yeast. It is an edible and nutrient-rich single-celled microorganism, which is called "inexhaustible nutrient source" in nutrition. Besides protein, carbohydrates and lipids, yeast is also rich in vitamins, minerals and enzymes. Therefore, steamed bread nourishes the stomach and reduces bloating. Steamed bread is fermented from flour, which is easier to digest and absorb. People with diarrhea caused by hyperacidity, abdominal distension and indigestion will feel comfortable and relieve their symptoms when eating baked steamed bread. 2. Nutritional function-protein content experiment proves that the protein content in one kilogram of dry yeast is equivalent to the protein content in five kilograms of rice, two kilograms of soybeans or two and a half kilograms of pork. Therefore, the nutritional content of steamed bread and bread is 3 to 4 times higher than that of pie and noodles, and nearly 2 times higher in protein. Second, the medicinal value of fermented yeast is also a strong antioxidant, which can protect the liver and has a certain detoxification effect. Selenium, chromium and other minerals in yeast have the functions of anti-aging, anti-tumor, preventing arteriosclerosis and improving human immunity. After fermentation, phytic acid which affects the absorption of calcium, magnesium, iron and other elements in flour can be decomposed, thus improving the absorption and utilization of these nutrients by human body. Three kinds of steamed bread with nutritional value are made from flour fermentation. The main nutrient is carbohydrate, which is the basic food for people to supplement energy.